refactor(annotations)!: improve annotation-based plugin generation

[joshuasing]

Summary
Rewrites the majority of the chameleon-annotations module.
Fixes #171

Changes

• Use template-based code generation to improve maintainability and readability. Previously JavaPoet was used, which resulted in code generation being hard to maintain and understand.
• Add a @PluginGeneratorOptions annotation, which allows users to further customise how generation works, such as how classes and packages are named.
• Overall code cleanup.

Checklist

• I acknowledge and agree to the terms of the Developer Certificate of Origin.
• All contributed code can be distributed under the terms of the MIT License.
• I have read the contributing guidelines and code of conduct.
• I have checked the "Allow edit from maintainers" option.
• I have added appropriate unit tests for my changes.

This pull request contains breaking changes.

THIS PULL REQUEST IS A WORK IN PROGRESS.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 69.20%. Comparing base (596b1a6) to head (3475ae2).
Report is 28 commits behind head on main.

❗ Current head 3475ae2 differs from pull request most recent head 1f8c72d. Consider uploading reports for the commit 1f8c72d to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #337      +/-   ##
============================================
- Coverage     69.76%   69.20%   -0.56%     
  Complexity      652      652              
============================================
  Files            90       89       -1     
  Lines          2163     2166       +3     
  Branches        147      148       +1     
============================================
- Hits           1509     1499      -10     
- Misses          618      633      +15     
+ Partials         36       34       -2     

Files	Coverage Δ
.../hypera/chameleon/util/internal/ChameleonUtil.java	12.50% <0.00%> (-20.84%)	⬇️

... and 6 files with indirect coverage changes