Adding mwaa_environment resource

[sanhaKimVics]

Description of your changes

Adding mwaa_environment resource #1093

I have:

• [v] Read and followed Crossplane's [contribution process].
• [v] Run make reviewable to ensure this PR is ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.

I tried to implement it v1.7.0. but I couldn't make a progress because of the error when I ran make submodules, make generate

10:03:14 [ OK ] go generate linux_arm64
10:03:14 [ .. ] go mod tidy
go: finding module for package github.com/upbound/provider-aws/apis/mwaa/v1beta1
go: github.com/upbound/provider-aws/internal/controller/mwaa/environment imports
github.com/upbound/provider-aws/apis/mwaa/v1beta1: no matching versions for query "latest"
10:03:20 [FAIL]
make[1]: *** [go.generate] Error 1
make: *** [generate] Error 2

How has this code been tested

[turkenf]

Hey @sanhaKimVics,

We appreciate your contribution, thank you :) The problem you describe seems to be caused by the changes here. The approach in this comment may solve your problem, could you please take a look?

[turkenf]

After this PR the problem should be solved, please ignore my comment above, reset your branch to main, and follow the steps of adding resources again.