Address Flutter 3.16 breaking changes

[erdemyerebasmaz]

This PR addresses breaking changes and deprecations introduced on Flutter 3.16.

Changelist:

As of this release, the default theme for Material Flutter apps is Material 3. Unless you explicitly specify Material 2 (with useMaterial3: false) in your app’s theme, your app will look different once you’ve updated.

• Disable Material 3 4d9c5ee

The Impeller runtime is now available for Android on Vulkan devices behind the --enable-impeller flag.

• Enable Flutter's new rendering engine, Impeller, on Android devices that support Vulkan e488ca5

Deprecated just-in-time navigation pop APIs for Android Predictive Back

• Deprecate just-in-time navigation pop APIs for Android Predictive Back c464e4a
  • Requires additional testing

Deprecate textScaleFactor in favor of TextScaler

• Deprecate textScaleFactor in favor of TextScaler 4f185f0
  • Requires additional testing
• Non-related SDK requirement: Add mandatory network field to placeholder LNInvoice e605835
  • Cherry-picked to main
• Temporary fix for mergeDebugNativeLibs errors 518d3aa
• Update dependencies to latest

[erdemyerebasmaz]

Findings:
"Deprecate just-in-time navigation pop APIs for Android Predictive Back" changes aren't working as expected when there's no NavigatorState available on context using native back button on Android.

⚠️ Do not merge until this is addressed. ⚠️

"Deprecate textScaleFactor in favor of TextScaler" changes has caused a slight difference in text size that are in acceptable levels, which is only noticeable on the large text scale factors.

Large text scale factor	Small text scale factor
Screen.Recording.2023-11-16.at.18.36.32.mov	Screen.Recording.2023-11-16.at.18.39.39.mov

Difference in underline color of text field is noted will be investigated, could be a focused/unfocused state difference.

[erdemyerebasmaz]

Findings: "Deprecate just-in-time navigation pop APIs for Android Predictive Back" changes aren't working as expected when there's no NavigatorState available on context using native back button on Android.

⚠️ Do not merge until this is addressed. ⚠️

Addressed here: Deprecate just-in-time navigation pop APIs for Android Predictive Back