Refactor WordAlignment as vertical slice

[Enkidu93]

Fixes #919

Also, added missing Translation tests

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This change is 

[codecov-commenter]

Codecov Report

❌ Patch coverage is 92.87902% with 93 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.93%. Comparing base (82456c4) to head (9bd1c17).

Files with missing lines	Patch %	Lines
...erval.WordAlignment/Features/Engines/StartBuild.cs	89.08%	21 Missing and 4 partials ⚠️
...rc/Serval.WordAlignment/Services/ContractMapper.cs	87.27%	17 Missing and 4 partials ⚠️
...Alignment/Features/Engines/UpdateParallelCorpus.cs	82.90%	16 Missing and 4 partials ⚠️
...val/src/Serval.WordAlignment/Services/DtoMapper.cs	94.21%	8 Missing and 2 partials ⚠️
...ordAlignment/Features/Engines/AddParallelCorpus.cs	94.59%	2 Missing and 2 partials ⚠️
...ment/Features/Engines/BuildRepositoryExtensions.cs	85.71%	1 Missing and 2 partials ⚠️
.../Serval.WordAlignment/Features/Engines/GetBuild.cs	92.30%	1 Missing and 2 partials ⚠️
...rval.WordAlignment/Features/Engines/CancelBuild.cs	94.87%	1 Missing and 1 partial ⚠️
...val.WordAlignment/Features/Engines/DeleteEngine.cs	93.33%	1 Missing and 1 partial ⚠️
...Alignment/Features/Engines/DeleteParallelCorpus.cs	97.22%	0 Missing and 1 partial ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #963      +/-   ##
==========================================
+ Coverage   65.54%   65.93%   +0.39%     
==========================================
  Files         381      390       +9     
  Lines       21798    21992     +194     
  Branches     2782     2786       +4     
==========================================
+ Hits        14288    14501     +213     
+ Misses       6461     6442      -19     
  Partials     1049     1049              

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[ddaspit]

@ddaspit partially reviewed 46 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on ddaspit).