Add class category

[Lipen]

This PR adds class category in EtsIR.

[github-actions]

Test results on JDK 19

 72 files  ±0   72 suites  ±0   4m 44s ⏱️ ±0s
632 tests +2  622 ✅ +2  10 💤 ±0  0 ❌ ±0 
704 runs  +3  694 ✅ +3  10 💤 ±0  0 ❌ ±0 

Results for commit cb4f5ce. ± Comparison against base commit b4d4f21.

♻️ This comment has been updated with latest results.

[github-actions]

Test results on JDK 8

 72 files  ±0   72 suites  ±0   4m 49s ⏱️ -1s
632 tests +2  619 ✅ +2  13 💤 ±0  0 ❌ ±0 
704 runs  +3  691 ✅ +3  13 💤 ±0  0 ❌ ±0 

Results for commit cb4f5ce. ± Comparison against base commit b4d4f21.

♻️ This comment has been updated with latest results.

[github-actions]

Test results on JDK 11

 72 files  ±0   72 suites  ±0   5m 14s ⏱️ +3s
632 tests +2  624 ✅ +2  8 💤 ±0  0 ❌ ±0 
704 runs  +3  696 ✅ +3  8 💤 ±0  0 ❌ ±0 

Results for commit cb4f5ce. ± Comparison against base commit b4d4f21.

♻️ This comment has been updated with latest results.

[github-actions]

Lifecycle test results

78 tests  ±0   78 ✅ ±0   1m 32s ⏱️ +3s
 7 suites ±0    0 💤 ±0 
 7 files   ±0    0 ❌ ±0 

Results for commit cb4f5ce. ± Comparison against base commit b4d4f21.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 69.41%. Comparing base (b4d4f21) to head (cb4f5ce).

Files with missing lines	Patch %	Lines
...-ets/src/main/kotlin/org/jacodb/ets/dto/Convert.kt	70.00%	2 Missing and 1 partial ⚠️
...ets/src/main/kotlin/org/jacodb/ets/graph/EtsCfg.kt	0.00%	1 Missing ⚠️
...in/kotlin/org/jacodb/ets/model/EtsClassCategory.kt	85.71%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                neo     #311      +/-   ##
============================================
+ Coverage     69.38%   69.41%   +0.02%     
- Complexity     2474     2476       +2     
============================================
  Files           269      270       +1     
  Lines         15451    15470      +19     
  Branches       2281     2282       +1     
============================================
+ Hits          10721    10738      +17     
- Misses         3802     3804       +2     
  Partials        928      928              

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