Add Protobuf/gRPC-based EtsIR loader

[Lipen]

This PR introduces a Protobuf-based EtsIR loader that communicates with the local ArkAnalyzer gRPC server, replacing the previous JSON-based approach.

[github-actions]

Lifecycle test results

78 tests  ±0   78 ✅ ±0   1m 30s ⏱️ +2s
 7 suites ±0    0 💤 ±0 
 7 files   ±0    0 ❌ ±0 

Results for commit 44e9de6. ± Comparison against base commit 126a4e8.

♻️ This comment has been updated with latest results.

[github-actions]

Test results on JDK 8

 73 files  +1   73 suites  +1   5m 0s ⏱️ +2s
636 tests +3  621 ✅ +1  15 💤 +2  0 ❌ ±0 
708 runs  +3  693 ✅ +1  15 💤 +2  0 ❌ ±0 

Results for commit 44e9de6. ± Comparison against base commit 126a4e8.

♻️ This comment has been updated with latest results.

[github-actions]

Test results on JDK 19

 73 files  +1   73 suites  +1   5m 4s ⏱️ +9s
636 tests +3  624 ✅ +1  12 💤 +2  0 ❌ ±0 
708 runs  +3  696 ✅ +1  12 💤 +2  0 ❌ ±0 

Results for commit 44e9de6. ± Comparison against base commit 126a4e8.

♻️ This comment has been updated with latest results.

[github-actions]

Test results on JDK 11

 73 files  +1   73 suites  +1   5m 33s ⏱️ -3s
636 tests +3  626 ✅ +1  10 💤 +2  0 ❌ ±0 
708 runs  +3  698 ✅ +1  10 💤 +2  0 ❌ ±0 

Results for commit 44e9de6. ± Comparison against base commit 126a4e8.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

Attention: Patch coverage is 32.85714% with 329 lines in your changes missing coverage. Please review.

Project coverage is 69.46%. Comparing base (126a4e8) to head (44e9de6).

Files with missing lines	Patch %	Lines
...ets/src/main/kotlin/org/jacodb/ets/grpc/Convert.kt	37.43%	208 Missing and 46 partials ⚠️
...c/main/kotlin/org/jacodb/ets/grpc/ManagerClient.kt	26.47%	25 Missing ⚠️
...c/main/kotlin/org/jacodb/ets/grpc/GreeterClient.kt	0.00%	20 Missing ⚠️
.../src/main/kotlin/org/jacodb/ets/grpc/GrpcServer.kt	0.00%	18 Missing ⚠️
...c/main/kotlin/org/jacodb/ets/grpc/GreeterServer.kt	0.00%	12 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                neo     #318      +/-   ##
============================================
- Coverage     70.63%   69.46%   -1.17%     
- Complexity     2460     2462       +2     
============================================
  Files           275      281       +6     
  Lines         15268    15764     +496     
  Branches       2267     2351      +84     
============================================
+ Hits          10784    10951     +167     
- Misses         3569     3848     +279     
- Partials        915      965      +50     

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