refactor(toml): add Scanner startsWith() method

[timreichen]

This reduces the usage of slice() and might have a positive impact on performance.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.08%. Comparing base (68a8460) to head (3e96168).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6532      +/-   ##
==========================================
- Coverage   95.08%   95.08%   -0.01%     
==========================================
  Files         576      576              
  Lines       43337    43339       +2     
  Branches     6466     6466              
==========================================
+ Hits        41208    41209       +1     
- Misses       2089     2090       +1     
  Partials       40       40              

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[kt3k]

Good idea. LGTM