Fix parsing of invalid yaml

[goccy]

fix #168
fix #305

Also, fixed invalid test cases for lexer because it uses tab indent

FYI: https://yaml.org/spec/1.2.2/#61-indentation-spaces

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 86.36364% with 3 lines in your changes missing coverage. Please review.

Project coverage is 78.03%. Comparing base (8f6f26e) to head (4d5be04).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #496      +/-   ##
==========================================
+ Coverage   77.77%   78.03%   +0.26%     
==========================================
  Files          18       18              
  Lines        5902     5922      +20     
==========================================
+ Hits         4590     4621      +31     
+ Misses       1037     1028       -9     
+ Partials      275      273       -2