refactor(yaml): add peek() and next() to LoaderState

[timreichen]

• adds peek() and next() methods to LoaderState

[codecov]

Codecov Report

Attention: Patch coverage is 89.28571% with 9 lines in your changes missing coverage. Please review.

Project coverage is 95.72%. Comparing base (9127978) to head (83cb304).

Files	Patch %	Lines
yaml/_loader.ts	89.28%	9 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5276   +/-   ##
=======================================
  Coverage   95.72%   95.72%           
=======================================
  Files         457      457           
  Lines       37951    37955    +4     
  Branches     5560     5560           
=======================================
+ Hits        36327    36331    +4     
  Misses       1583     1583           
  Partials       41       41           

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[kt3k]

LGTM

[iuioiua]

Nice