refactor(yaml): merge yaml/_dumper/ files

[timreichen]

• merges _dumper/dumper.ts and _dumper/dumper_state into _dumper/dumper.ts

[codecov]

Codecov Report

Attention: Patch coverage is 95.38462% with 3 lines in your changes missing coverage. Please review.

Project coverage is 95.30%. Comparing base (6f33e7f) to head (ade2203).

Files	Patch %	Lines
yaml/_dumper/dumper.ts	95.38%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5260      +/-   ##
==========================================
- Coverage   95.66%   95.30%   -0.37%     
==========================================
  Files         460      459       -1     
  Lines       38020    38015       -5     
  Branches     5559     5528      -31     
==========================================
- Hits        36373    36229     -144     
- Misses       1606     1745     +139     
  Partials       41       41              

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[iuioiua]

LGTM. Thank you.