Support entry token for flow style

[goccy]

• add sequence entry node for flow sequence.
• add collect entry token field to mapping value node for flow mapping.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 68.18182% with 14 lines in your changes missing coverage. Please review.

Project coverage is 77.25%. Comparing base (e6c495e) to head (f6d4031).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #646      +/-   ##
==========================================
- Coverage   77.29%   77.25%   -0.04%     
==========================================
  Files          22       22              
  Lines        7888     7914      +26     
==========================================
+ Hits         6097     6114      +17     
- Misses       1372     1378       +6     
- Partials      419      422       +3