docs: Add Javadoc comments for services

[o-kopysov]

Pull Request

Description

Current PR contains final updates in Javadoc comments and covers all services.

Fixes #307

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Code cleanup/refactoring
• Documentation update
• This change requires a documentation update
• CI system update
• Test Coverage update

Checklist:

• My code follows the style guidelines of this project
• My code meets the required code coverage for lines (90% and above)
• My code meets the required code coverage for branches (80% and above)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b569962) 91.34% compared to head (0cdf65e) 91.34%.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #360   +/-   ##
=========================================
  Coverage     91.34%   91.34%           
  Complexity      475      475           
=========================================
  Files            48       48           
  Lines          1606     1606           
  Branches        194      194           
=========================================
  Hits           1467     1467           
  Misses           82       82           
  Partials         57       57           

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[tdrozdovsky]

LGTM

[m-rudyk]

Approved