feat(action): add optional input checkout

[remarkablemark]

What is the motivation for this pull request?

feat(action): add optional input checkout

What is the current behavior?

You need to add checkout step with fetch-depth set to 0 before running commitlint action:

- uses: actions/checkout@v4
  with:
    fetch-depth: 0
- uses: remarkablemark/commitlint@v1

What is the new behavior?

Action will checkout all history with input:

- uses: remarkablemark/commitlint@v1
  with:
    checkout: true

Checklist:

• Conventional Commits
• Tests
• Documentation