feat: support pull_request_target events

[kadams54]

Description

pull_request events don't have the necessary privileges to access private repos. Adding support for the pull_request_target event will allow private repos to also use commit lint.

Related Issue

[If your pull request is related to an existing issue, reference it here using the format "Fixes #issue_number".]

Type of Change

Please mark the appropriate option below to describe the type of change your pull request introduces:

• [ ] Bug fix
• [x] New feature
• [ ] Enhancement
• [ ] Documentation update
• [ ] Refactor
• [ ] Other (please specify)

Checklist

• [x] My pull request has a clear title and description.
• [x] I have used semantic commit messages. Examples: "fix: Fixed foobar bug", "feat(accounts): Added foobar feature".
• [x] I have added/updated the necessary documentation on README.md.
• [x] I have added appropriate test cases (if applicable) to ensure the changes are functioning correctly.

Additional Notes

[Add any additional notes or context that you think the reviewers should know about.]

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[aj3sh]

Hi @kadams54, Thank you for contributing and adding a new feature in the commitlint. We will quickly review the code and the pull_request_target event details. This is a must-have feature that we have missed.