feat!: bump java default targets to 11

[erisu]

Motivation and Context

Resolve build warnings about Java 8 being obsolete.

warning: [options] source value 8 is obsolete and will be removed in a future release
warning: [options] target value 8 is obsolete and will be removed in a future release

Description

• Java Source Compatibility to 11
• Java Target Compatibility to 11
• Remove Java 8 prefixing logic
• Refactor/Cleanup Kotlin jvmTarget logic

Testing

• Create project
• Build project
• Open Android Studio and built project there also.
• Confirmed warnings are removed
• Confirmed sample application launched in emulator

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.50%. Comparing base (7544fdf) to head (2edab74).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1784   +/-   ##
=======================================
  Coverage   72.50%   72.50%           
=======================================
  Files          23       23           
  Lines        1837     1837           
=======================================
  Hits         1332     1332           
  Misses        505      505           

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