Using fixed commit hash or tag name as the expected key

[Quramy]

Proposal:

Add new reg-keygen-git-hash-plugin opetion expected.type.

"plugins": {
  "reg-keygen-git-hash": {
      "expectedType": "revision",
      "expectedRevision": "v1.0.0"
  }
}

And if using base-hash pattern, config follows:

"plugins": {
  "reg-keygen-git-hash": {
      "expectedType": "base-commit"
  }
}