Support project loom threads properly

[ascopes]

This enables the use of the newer thread ID support that cannot be spoofed or overridden in the OpenJDK implementation.

[github-actions]

Test Results

  1 139 files  +10    1 139 suites  +10   0s ⏱️ ±0s
14 798 tests +90  14 788 ✔️ +80  10 💤 +10  0 ❌ ±0 
15 028 runs  +90  15 018 ✔️ +80  10 💤 +10  0 ❌ ±0 

Results for commit 53a0e0e. ± Comparison against base commit 62f7915.

[codecov-commenter]

Codecov Report

Merging #268 (53a0e0e) into main (62f7915) will increase coverage by 0.05%.
The diff coverage is 46.15%.

@@            Coverage Diff             @@
##             main     #268      +/-   ##
==========================================
+ Coverage   71.12%   71.18%   +0.05%     
==========================================
  Files          73       74       +1     
  Lines        2556     2561       +5     
  Branches      239      239              
==========================================
+ Hits         1818     1823       +5     
  Misses        671      671              
  Partials       67       67              

Impacted Files	Coverage Δ
...opes/jct/filemanagers/LoggingFileManagerProxy.java	1.58% <0.00%> (ø)
...pes/jct/diagnostics/TracingDiagnosticListener.java	100.00% <100.00%> (ø)
...java/io/github/ascopes/jct/utils/LoomPolyfill.java	100.00% <100.00%> (ø)