feat: add token input

[privatenumber]

Is your feature request related to a problem? Please describe.

Manually passing in GITHUB_TOKEN is unnecessary.

Describe the solution you'd like

Extracted as default input. For example:

• https://github.com/actions/checkout/blob/01aecccf739ca6ff86c0539fbc67a7a5007bbc81/action.yml#L12
• https://github.com/jitterbit/await-check-suites/blob/master/action.yml#L22-L27

Describe alternatives you've considered

Additional context