Add hashCode for EtsClassSignature

[Lipen]

This PR adds hashCode() impl for EtsClassSignature which already overrides equals.

[github-actions]

Lifecycle test results

78 tests  ±0   78 ✅ ±0   1m 49s ⏱️ -7s
 7 suites ±0    0 💤 ±0 
 7 files   ±0    0 ❌ ±0 

Results for commit 28d2b4d. ± Comparison against base commit 00164e3.

[github-actions]

Test results on JDK 19

   83 files  ±0     83 suites  ±0   25m 53s ⏱️ +9s
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 28d2b4d. ± Comparison against base commit 00164e3.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.54%. Comparing base (00164e3) to head (28d2b4d).

Additional details and impacted files

@@            Coverage Diff            @@
##                neo     #252   +/-   ##
=========================================
  Coverage     59.53%   59.54%           
  Complexity     2238     2238           
=========================================
  Files           309      309           
  Lines         18297    18298    +1     
  Branches       3261     3261           
=========================================
+ Hits          10894    10895    +1     
  Misses         6329     6329           
  Partials       1074     1074           

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[github-actions]

Test results on JDK 11

   83 files  ±0     83 suites  ±0   29m 27s ⏱️ +5s
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 28d2b4d. ± Comparison against base commit 00164e3.

[github-actions]

Test results on JDK 8

   83 files  ±0     83 suites  ±0   32m 37s ⏱️ + 3m 36s
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 28d2b4d. ± Comparison against base commit 00164e3.