Fix naming ambiguities and inconsistencies in the API

[ascopes]

Closes #447.

Renames several places that access container groups to ensure naming of methods matches the naming scheme used in the rest of the API. Existing methods that are poorly named are deprecated for removal in v1.0.0.

Also fixes a bug in fuzzy name matching within JAR files for PackageContainerAssert that I managed to trigger when updating integration tests.

[github-actions]

Test Results

  2 685 files  ±    0    2 685 suites  ±0   2s ⏱️ -1s
31 503 tests +261  31 208 ✔️ +261  295 💤 ±0  0 ❌ ±0 
31 839 runs  +261  31 544 ✔️ +261  295 💤 ±0  0 ❌ ±0 

Results for commit e5f1cf0. ± Comparison against base commit 6dec6ac.

[codecov-commenter]

Codecov Report

Merging #448 (e5f1cf0) into main (6dec6ac) will decrease coverage by 0.05%.
The diff coverage is 78.57%.

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@@            Coverage Diff             @@
##             main     #448      +/-   ##
==========================================
- Coverage   85.90%   85.86%   -0.05%     
==========================================
  Files          93       93              
  Lines        2973     2985      +12     
  Branches      240      241       +1     
==========================================
+ Hits         2554     2563       +9     
- Misses        373      374       +1     
- Partials       46       48       +2     

Impacted Files	Coverage Δ
...es/jct/assertions/PackageContainerGroupAssert.java	94.73% <50.00%> (-5.27%)	⬇️
...b/ascopes/jct/assertions/JctCompilationAssert.java	100.00% <100.00%> (ø)