Parse multiple documents

[felipesere]

This now has 2 tests as I created a new one before I spotted the one at the bottom.

I tested this locally and it happily works through my large Kubernetes manifests finding the correct rule violations.

fixes #746

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 81.25000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 94.72%. Comparing base (a27ad9b) to head (93ef074).

Files	Patch %	Lines
internal/parser/parser.go	81.25%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #894      +/-   ##
==========================================
- Coverage   94.75%   94.72%   -0.03%     
==========================================
  Files          92       92              
  Lines        8729     8740      +11     
==========================================
+ Hits         8271     8279       +8     
- Misses        315      317       +2     
- Partials      143      144       +1     

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