Add Raw Stmt/Value/Type

[Lipen]

This PR adds "Raw" (or rather, "unrecognized", "unsupported", "unknown", "unhandled") statements/values/types with custom de/serializers. This PR also removes all toString() for DTOs, because toString() is only meaningful for the "real" objects in Ets hierarchy.

[github-actions]

Lifecycle test results

78 tests  ±0   78 ✅ ±0   2m 36s ⏱️ -2s
 7 suites ±0    0 💤 ±0 
 7 files   ±0    0 ❌ ±0 

Results for commit ef2a362. ± Comparison against base commit fe53361.

♻️ This comment has been updated with latest results.

[github-actions]

Test results on JDK 19

 69 files  ±0   69 suites  ±0   4m 53s ⏱️ -23s
597 tests +3  587 ✅ +3  10 💤 ±0  0 ❌ ±0 
667 runs  +3  657 ✅ +3  10 💤 ±0  0 ❌ ±0 

Results for commit ef2a362. ± Comparison against base commit fe53361.

♻️ This comment has been updated with latest results.

[github-actions]

Test results on JDK 11

 69 files  ±0   69 suites  ±0   5m 22s ⏱️ -7s
597 tests +3  589 ✅ +3  8 💤 ±0  0 ❌ ±0 
667 runs  +3  659 ✅ +3  8 💤 ±0  0 ❌ ±0 

Results for commit ef2a362. ± Comparison against base commit fe53361.

♻️ This comment has been updated with latest results.

[github-actions]

Test results on JDK 8

 69 files  ±0   69 suites  ±0   7m 47s ⏱️ +10s
597 tests +3  584 ✅ +3  13 💤 ±0  0 ❌ ±0 
667 runs  +3  654 ✅ +3  13 💤 ±0  0 ❌ ±0 

Results for commit ef2a362. ± Comparison against base commit fe53361.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

Attention: Patch coverage is 47.78761% with 59 lines in your changes missing coverage. Please review.

Project coverage is 71.50%. Comparing base (fe53361) to head (ef2a362).
Report is 1 commits behind head on neo.

Files with missing lines	Patch %	Lines
...ets/src/main/kotlin/org/jacodb/ets/base/EtsType.kt	0.00%	11 Missing ⚠️
...s/src/main/kotlin/org/jacodb/ets/base/EtsEntity.kt	0.00%	10 Missing ⚠️
...ets/src/main/kotlin/org/jacodb/ets/base/EtsStmt.kt	0.00%	10 Missing ⚠️
...-ets/src/main/kotlin/org/jacodb/ets/dto/Convert.kt	0.00%	9 Missing ⚠️
.../src/main/kotlin/org/jacodb/ets/dto/Serializers.kt	81.25%	6 Missing and 3 partials ⚠️
...db-ets/src/main/kotlin/org/jacodb/ets/dto/Types.kt	58.33%	5 Missing ⚠️
...b-ets/src/main/kotlin/org/jacodb/ets/dto/Values.kt	25.00%	3 Missing ⚠️
...db-ets/src/main/kotlin/org/jacodb/ets/dto/Model.kt	80.00%	1 Missing ⚠️
...s/src/main/kotlin/org/jacodb/ets/dto/Signatures.kt	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                neo     #291      +/-   ##
============================================
+ Coverage     70.78%   71.50%   +0.71%     
  Complexity     2438     2438              
============================================
  Files           252      252              
  Lines         14608    14507     -101     
  Branches       2109     2098      -11     
============================================
+ Hits          10341    10373      +32     
+ Misses         3393     3264     -129     
+ Partials        874      870       -4     

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