Avoid global synchronization

[Saloed]

Since ASM nodes are mutable, any operation requires synchronization. Currently we use global synchronization in flowGraph which significantly affects performance in a concurrent environment.

[github-actions]

Lifecycle test results

78 tests  ±0   78 ✅ ±0   1m 56s ⏱️ +3s
 7 suites ±0    0 💤 ±0 
 7 files   ±0    0 ❌ ±0 

Results for commit f5e77cd. ± Comparison against base commit 4b15fc6.

[github-actions]

Test results on JDK 19

   83 files  ±0     83 suites  ±0   27m 7s ⏱️ -23s
2 511 tests ±0  2 469 ✅ ±0  42 💤 ±0  0 ❌ ±0 
2 539 runs  ±0  2 497 ✅ ±0  42 💤 ±0  0 ❌ ±0 

Results for commit f5e77cd. ± Comparison against base commit 4b15fc6.

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 60.05%. Comparing base (4b15fc6) to head (f5e77cd).

Files	Patch %	Lines
...in/kotlin/org/jacodb/impl/cfg/MethodNodeBuilder.kt	88.88%	0 Missing and 1 partial ⚠️
...mpl/features/classpaths/virtual/JcVirtualMethod.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                neo     #247      +/-   ##
============================================
+ Coverage     60.03%   60.05%   +0.01%     
+ Complexity     2244     2242       -2     
============================================
  Files           310      310              
  Lines         18122    18131       +9     
  Branches       3259     3260       +1     
============================================
+ Hits          10880    10889       +9     
  Misses         6164     6164              
  Partials       1078     1078              

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[github-actions]

Test results on JDK 11

   83 files  ±0     83 suites  ±0   30m 19s ⏱️ -6s
2 511 tests ±0  2 471 ✅ ±0  40 💤 ±0  0 ❌ ±0 
2 539 runs  ±0  2 499 ✅ ±0  40 💤 ±0  0 ❌ ±0 

Results for commit f5e77cd. ± Comparison against base commit 4b15fc6.

[github-actions]

Test results on JDK 8

   83 files  ±0     83 suites  ±0   30m 45s ⏱️ - 1m 47s
2 511 tests ±0  2 466 ✅ ±0  45 💤 ±0  0 ❌ ±0 
2 539 runs  ±0  2 494 ✅ ±0  45 💤 ±0  0 ❌ ±0 

Results for commit f5e77cd. ± Comparison against base commit 4b15fc6.