Refactor gradle plugin so that tasks can be constructed independently

[edward3h]

Add independent properties to the task classes, and modify how they get "wired" with extension properties. New test case "jte-runtime-cp-test-gradle-newtask" demonstrates how a task can be created.

I also tried out changing Property<Path> to DirectoryProperty and Property<String[]> to ListProperty<String>, but I concluded this is not possible without breaking existing users of the plugin. Perhaps something to add if we make a new major version.

[edward3h]

I should have done a clean and rerun tests before I committed :)

[edward3h]

I pushed my implementation of a workaround, to make sure checks pass. This still needs some code comments to explain, and documentation updates.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.17%. Comparing base (e1803ae) to head (0e8f095).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #478   +/-   ##
=========================================
  Coverage     91.17%   91.17%           
  Complexity     1223     1223           
=========================================
  Files            76       76           
  Lines          3174     3174           
  Branches        492      492           
=========================================
  Hits           2894     2894           
  Misses          169      169           
  Partials        111      111           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.