feat: preserve line breaks from original input

[mcwarman]

Motivation

Preserve the line breaks from input.

We use this project as dependency in a project that round trips YAML, this attempts to try and preserve the formatting. It will only ever add one line break between lines regardless of input.

Changes

• add checkLineBreak method that uses the previous token to calculate if there should be a line break
• account for token.SequenceEntryType using the previous token of that.
• ensure multiline strings are accounted for in the logic
• add a new table test
• update existing test to validate string output has changed
• update existing tests to output differences on failure

Checks

• [x] Describe the purpose for which you created this PR.
• [x] Create test code that corresponds to the modification

[codecov-commenter]

Codecov Report

Merging #412 (bf7faf1) into master (0640a15) will not change coverage. The diff coverage is n/a.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #412   +/-   ##
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  Coverage   76.02%   76.02%           
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  Files          13       13           
  Lines        4692     4692           
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  Hits         3567     3567           
  Misses        866      866           
  Partials      259      259           

[mcwarman]

@goccy I'd be interested to get your thoughts on this.

If you specifically have reservations/thoughts on how the change could be behind a feature flag for backwards compatibility, let me know.

[olblak]

@goccy Kindly pinging you in cased you missed the previous notification. It would be awesome to see this pullrequest moving forward