feat(all): Update Kotlin language version to 2.2.0

[mattcreaser]

• PR conforms to Pull Request guidelines.

Issue #, if available:

Description of changes:

• Updates Kotlin version to 2.2.0
• Updates Amplify dependency to 2.29.2
• Updates sample apps to use Kotlin buildscript
• Updates sample apps to use convention plugin

How did you test these changes?

• Verified apps build and run as normal

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests
• Added Integration Tests
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Ensure commit message has the appropriate scope (e.g fix(liveness): message, fix(authenticator): message, fix(all): message)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 32.59%. Comparing base (d4e5edb) to head (cfaddf6).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #256      +/-   ##
==========================================
- Coverage   32.69%   32.59%   -0.11%     
==========================================
  Files         100      100              
  Lines        4569     4608      +39     
  Branches      542      583      +41     
==========================================
+ Hits         1494     1502       +8     
+ Misses       2952     2950       -2     
- Partials      123      156      +33     

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