🔧 Update github issue template (#903)

.github/ISSUE_TEMPLATE/flutter_bug_report.yml

@@ -0,0 +1,76 @@
+name: Flutter plugin bug report
+description: bug report
+title: "[Bug report] "
+body:
+  - type: input
+    id: version
+    attributes:
+      label: Version
+      description: Version of the plugin
+      placeholder: ex. 2.5.2
+    validations:
+      required: true
+  - type: dropdown
+    id: platforms
+    attributes:
+      label: Platforms
+      description: Check all that apply
+      multiple: true
+      options:
+        - dart
+        - Android
+        - iOS
+        - macOS
+    validations:
+      required: true
+  - type: input
+    id: device-model
+    attributes:
+      label: Device Model
+      description: "Device Model (ex. iPhone 12(iOS 14), Galaxy S21(Android 11))"
+      placeholder: ex. iPhone 12 (iOS 14)
+    validations:
+      required: true
+  - type: textarea
+    id: flutter-doctor
+    attributes:
+      label: flutter info
+      description: "flutter doctor -v in your terminal"
+      placeholder: ex. flutter doctor -v
+      render: sh
+    validations:
+      required: true
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: "How to reproduce?"
+      description: "How to reproduce the problem?"
+      placeholder: "ex. I found a bug when I call the PhotoManager.getAssetPathList method."
+    validations:
+      required: true
+  - type: textarea
+    id: log
+    attributes:
+      label: Logs
+      description: "Error log"
+      placeholder: ex. flutter run --verbose
+      render: sh
+    validations:
+      required: false
+  - type: textarea
+    id: example-code
+    attributes:
+      label: "Example code (optional)"
+      description: "If you can, please provide a minimal example to reproduce the problem."
+      placeholder: "ex.  PhotoManager.editor.saveImageWithId(id, quality: 100)"
+      render: Dart
+    validations:
+      required: false
+  - type: input
+    id: contact
+    attributes:
+      label: Contact
+      description: Your contace (no requird)
+      placeholder: ex. [email protected] / twitter / github
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/flutter_discussions.yml

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+name: Discussions
+description: Discussions
+title: "[Discussions] "
+body:
+  - type: markdown
+    attributes:
+      value: |
+        First check whether the project has Discussions enabled.
+        If so, it is recommended to use Discussions to create discussions.
+        The discussions is here:
+        [Discussions](https://github.com/FlutterCandies/flutter_photo_manager/discussions)

.github/ISSUE_TEMPLATE/flutter_how_to_use.yml

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+name: How to use
+description: How to use the Flutter plugin
+title: "[How to use] "
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this issue!
+        You need read document before you ask question.
+        If you can, search the issue list
+        or [StackOverflow](https://stackoverflow.com/questions/tagged/flutter)
+        to see if someone has asked the same question.
+  - type: dropdown
+    id: platforms
+    attributes:
+      label: Platforms
+      description: Check all that apply
+      multiple: true
+      options:
+        - dart
+        - Android
+        - iOS
+        - macOS
+    validations:
+      required: true
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: "Describe the feature you want to be added"
+      placeholder: "ex. I want to add a new method to get the thumbnail of the asset."
+    validations:
+      required: true
+  - type: textarea
+    id: my-code
+    attributes:
+      label: My code
+      description: "I want to know how to use the method."
+      placeholder: ｜
+        'ex. I want to get the thumbnail of the asset to display it in the list.'
+    validations:
+      required: false
+  - type: textarea
+    id: try-do-it
+    attributes:
+      label: Try do it
+      description: "I have tried to do it, but I don't know how to do it."
+      placeholder: ｜
+        'ex. I want to get the thumbnail of the asset to display it in the list.'
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/flutter_new_feature.yml

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+name: "Flutter new feature request"
+description: "Request a new feature for the Flutter plugin"
+title: "[Feature request] "
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this feature request!
+        Before submitting, make sure you read the document and search the issue list.
+        If you are not sure, you can run the example code
+        first to understand the example that may be your requirement.
+  - type: dropdown
+    id: platforms
+    attributes:
+      label: Platforms
+      description: Check all that apply
+      multiple: true
+      options:
+        - dart
+        - Android
+        - iOS
+        - macOS
+    validations:
+      required: true
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: "Describe the feature you want to be added"
+      placeholder: "ex. I want to add a new method to get the thumbnail of the asset."
+    validations:
+      required: true
+  - type: textarea
+    id: why
+    attributes:
+      label: Why
+      description: "Why do you want this feature to be added? What's the use case?"
+      placeholder: ｜
+        ex. I want to get the thumbnail of the asset to display it in the list.
+    validations:
+      required: false
+  - type: markdown
+    attributes:
+      value: |
+        Add as many or as many reasons as possible,
+        which will give priority to feature request