feat: cache loader with external variable reference

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 73.07692% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 67.65%. Comparing base (fbd2a5e) to head (836ab47).

Files	Patch %	Lines
.../java/io/arex/inst/cache/util/CacheLoaderUtil.java	78.94%	3 Missing and 1 partial :warning:
...t/cache/caffeine/CaffeineAsyncInstrumentation.java	0.00%	1 Missing :warning:
...st/cache/caffeine/CaffeineSyncInstrumentation.java	0.00%	1 Missing :warning:
...rex/inst/dynamic/common/DynamicClassExtractor.java	75.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #434 +/- ## ============================================ + Coverage 67.63% 67.65% +0.01% - Complexity 3579 3582 +3 ============================================ Files 410 410 Lines 13646 13654 +8 Branches 1622 1626 +4 ============================================ + Hits 9230 9237 +7 - Misses 3711 3713 +2 + Partials 705 704 -1 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
87.5% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud