Fix parsing of directive value

[goccy]

Breaking Changes

ast.DirectiveNode has the Name and Values field.

• Name: directive name e.g.) YAML or TAG
• Values : directive values e.g.) 1.2 or !! tag:clarkevans.com,2002:app/

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Codecov Report

Attention: Patch coverage is 71.00592% with 49 lines in your changes missing coverage. Please review.

Project coverage is 77.39%. Comparing base (264b167) to head (e646ff7).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #578      +/-   ##
==========================================
- Coverage   77.48%   77.39%   -0.10%     
==========================================
  Files          21       21              
  Lines        7502     7630     +128     
==========================================
+ Hits         5813     5905      +92     
- Misses       1293     1318      +25     
- Partials      396      407      +11