feat: Add option in block-sequence-hyphen-indicator-newline

[sun-yryr]

This is my first pull request to this repository, so please let me know if I am doing something wrong.
Also, sorry if I used broken English.

why

JetBrains IDE can fix Yaml file as follows.

# Before
- !!str "a"
- 'b'
- &anchor "c"
- *anchor
- !!str [ 1, 2 ]
- { a: b }
- [ 1, 2 ]
- name: a
  value: b
- - a
  - b

# After
- !!str "a"
- 'b'
- &anchor "c"
- *anchor
- !!str [ 1, 2 ]
- { a: b }
- [ 1, 2 ]
-
  name: a
  value: b
-
  - a
  - b

Similar to rule block-sequence-hyphen-indicator-newline , but block-sequence-hyphen-indicator-newline actually adds a line break after all hyphen.

what

Add a new option blockMapping in block-sequence-hyphen-indicator-newline.
Defaults, this option is follows global style. If the option is set, it controls the line breaks in the block mapping accordingly.

[changeset-bot]

🦋 Changeset detected

Latest commit: 12784ac

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
eslint-plugin-yml	Minor

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[ota-meshi]

Thank you for this PR.

Could you please add to the rule documentation how the new options work?

[ota-meshi]

Please add test cases that does not use nestedHyphen.

[sun-yryr]

Thank you for waiting long time.
Update document and add new test suites. Please review again.

Maybe resolve #243

[ota-meshi]

When I checked the test cases, it seems that they do not include the block mapping test case.

Could you please add xx-input.yml under tests/fixtures/rules/block-sequence-hyphen-indicator-newline/invalid and tests/fixtures/rules/block-sequence-hyphen-indicator-newline/valid directory and write the config using comments at the beginning of files?

Please also refer to https://github.com/ota-meshi/eslint-plugin-yml/blob/master/tests/fixtures/rules/block-mapping/invalid/block-and-comment01-input.yml.

[ota-meshi]

Thank you!