[jacodb-core] In JarFacade, avoid caching JarEntries returned by JarFile

[Saloed]

Some implementations of JarEntry are inner classes referencing their JarFiles for doing some internal checks,e.g., on getting input stream. Such caching may require the JarFiles to always be open. To address the issue, copies of all JarEntries should be cached.

[github-actions]

Lifecycle test results

78 tests  ±0   78 ✅ ±0   1m 26s ⏱️ -1s
 7 suites ±0    0 💤 ±0 
 7 files   ±0    0 ❌ ±0 

Results for commit f725afa. ± Comparison against base commit ad9d047.

[github-actions]

Test results on JDK 19

 72 files  ±0   72 suites  ±0   4m 34s ⏱️ -9s
628 tests +1  618 ✅ +1  10 💤 ±0  0 ❌ ±0 
698 runs  +1  688 ✅ +1  10 💤 ±0  0 ❌ ±0 

Results for commit f725afa. ± Comparison against base commit ad9d047.

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 69.43%. Comparing base (ad9d047) to head (f725afa).
Report is 1 commits behind head on neo.

Files with missing lines	Patch %	Lines
...db-core/src/main/kotlin/org/jacodb/impl/fs/Jars.kt	33.33%	0 Missing and 2 partials ⚠️
...c/main/kotlin/org/jacodb/impl/util/SequenceUtil.kt	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                neo     #303      +/-   ##
============================================
- Coverage     69.43%   69.43%   -0.01%     
- Complexity     2474     2475       +1     
============================================
  Files           271      271              
  Lines         15450    15455       +5     
  Branches       2282     2284       +2     
============================================
+ Hits          10728    10731       +3     
  Misses         3791     3791              
- Partials        931      933       +2     

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[github-actions]

Test results on JDK 8

 72 files  ±0   72 suites  ±0   4m 47s ⏱️ +3s
628 tests +1  615 ✅ +1  13 💤 ±0  0 ❌ ±0 
698 runs  +1  685 ✅ +1  13 💤 ±0  0 ❌ ±0 

Results for commit f725afa. ± Comparison against base commit ad9d047.

[github-actions]

Test results on JDK 11

 72 files  ±0   72 suites  ±0   5m 16s ⏱️ +4s
628 tests +1  620 ✅ +1  8 💤 ±0  0 ❌ ±0 
698 runs  +1  690 ✅ +1  8 💤 ±0  0 ❌ ±0 

Results for commit f725afa. ± Comparison against base commit ad9d047.