Support exempt-labels and only-labels input option

[peaceiris]

Is your feature request related to a problem? Please describe

  exempt-issue-labels:
    description: 'The labels to apply when an issue is exempt from being marked a target of suggesting. Separate multiple labels with commas (eg. "label1,label2")'
    default: ''
  only-labels:
    description: 'Only issues with all of these labels are the target of suggesting. Defaults to `[]` (disabled) and can be a comma-separated list of labels.'
    default: ''

Describe the solution you'd like

      - uses: peaceiris/actions-suggest-related-links@v1
        with:
          exempt-issue-labels: 'proposal'

Describe alternatives you've considered

N/A

Additional context

• https://github.com/actions/stale/blob/1849651e2aa1b1d6d2cba4c90c719f4b6c929a28/action.yml

[github-actions]

Related links:

- (0.801) [Rename option name force_orphan to keep_history](https://github.com/peaceiris/actions-gh-pages/issues/352)
- (0.794) [Support Ubuntu 20.04 LTS](https://github.com/peaceiris/actions-gh-pages/issues/268)
- (0.770) [proposal: Custom commit message option](https://github.com/peaceiris/actions-gh-pages/issues/74)

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