refactor(no-unlocalized-strings): merge visitors

[timofei-iatsenko]

merge Literal and TemplateLiteral visitors into one. Inline methods which was extracted to be used in these two visitors.

[codecov]

Codecov Report

Attention: Patch coverage is 98.70130% with 1 line in your changes missing coverage. Please review.

Project coverage is 96.44%. Comparing base (b36edbf) to head (3cd074f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/rules/no-unlocalized-strings.ts	98.70%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #59      +/-   ##
==========================================
+ Coverage   95.91%   96.44%   +0.52%     
==========================================
  Files          10       10              
  Lines         490      450      -40     
  Branches      162      156       -6     
==========================================
- Hits          470      434      -36     
+ Misses         20       16       -4     

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