Refactor Ets values, operations, visitors

[Lipen]

This PR introduces some improvements in the design of Ets operations (enums are replaced with classes) and also simplifies EtsValue visitors (merge visitors for Immediate, Constant, Ref into one).

In addition, the type of EtsIfStmt.condition was changed from EtsConditionExpr to EtsEntity, since JS/TS allows "implicit" constructions such as if (x) {...}. See also: https://gitee.com/openharmony-sig/arkanalyzer/issues/IAHIJ5

[github-actions]

Lifecycle test results

78 tests  ±0   78 ✅ ±0   1m 54s ⏱️ -1s
 7 suites ±0    0 💤 ±0 
 7 files   ±0    0 ❌ ±0 

Results for commit 68038a1. ± Comparison against base commit 133474f.

♻️ This comment has been updated with latest results.

[github-actions]

Test results on JDK 19

   83 files  ±0     83 suites  ±0   27m 39s ⏱️ + 2m 7s
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 68038a1. ± Comparison against base commit 133474f.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

Attention: Patch coverage is 12.13873% with 304 lines in your changes missing coverage. Please review.

Project coverage is 59.41%. Comparing base (133474f) to head (68038a1).

Files	Patch %	Lines
...ets/src/main/kotlin/org/jacodb/ets/base/EtsExpr.kt	10.28%	218 Missing ⚠️
...rc/main/kotlin/org/jacodb/ets/utils/GetOperands.kt	0.00%	38 Missing ⚠️
...-ets/src/main/kotlin/org/jacodb/ets/dto/Convert.kt	32.65%	30 Missing and 3 partials ⚠️
...ts/src/main/kotlin/org/jacodb/ets/base/EtsValue.kt	0.00%	14 Missing ⚠️
...s/src/main/kotlin/org/jacodb/ets/base/EtsEntity.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                neo     #249      +/-   ##
============================================
- Coverage     60.03%   59.41%   -0.63%     
- Complexity     2244     2247       +3     
============================================
  Files           310      309       -1     
  Lines         18122    18305     +183     
  Branches       3259     3260       +1     
============================================
- Hits          10880    10875       -5     
- Misses         6164     6354     +190     
+ Partials       1078     1076       -2     

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[github-actions]

Test results on JDK 11

   83 files  ±0     83 suites  ±0   29m 19s ⏱️ - 2m 21s
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 68038a1. ± Comparison against base commit 133474f.

♻️ This comment has been updated with latest results.

[github-actions]

Test results on JDK 8

   83 files  ±0     83 suites  ±0   33m 52s ⏱️ + 1m 29s
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 68038a1. ± Comparison against base commit 133474f.

♻️ This comment has been updated with latest results.