Feature request: Customization option for messages?

[Andre601]

Please check these things before submitting your issue:

• I searched for duplicate or closed feature request here

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

Describe the solution you'd like
I saw through the Active GitHub Forks page that this fork seems to be the most active and up to date one, so I post my feature request here in the hope it will be looked into.

The idea is, to allow the customization of the different action messages to give a bit more creativity.

As an example, imagine the following configuration setup:

    steps:
      - uses: actions/checkout@v2
      - uses: PuneetGopinath/github-activity-readme@master
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          COMMIT_MSG: "Update latest activities 🎉"
          
          # Comments
          COMMENT: "Commented on [`{REPO}#{ID}`]({URL})"
          
          # Pull requests
          PR_OPEN: "Opened Pull request [`{REPO}#{ID}`]({URL})"
          PR_CLOSE: "Closed Pull request [`{REPO}#{ID}`]({URL})"
          PR_MERGE: "Merged Pull request [`{REPO}#{ID}`]({URL})"
          
          # Issues
          ISSUE_OPEN: "Opened Issue [`{REPO}#{ID}`]({URL})"
          ISSUE_CLOSE: "Closed Issue [`{REPO}#{ID}`]({URL})"

You can see some {PLACEHOLDER} text there. They would do the following things:

• {REPO}
  Will be changed to the Username/Repository format (i.e. Andre601/Andre601).
• {ID}
  Will be changed to the issue, PR or Discussion ID this action belongs to.
• {URL}
  Will be changed to the URL to view the issue, PR or Discussion.

The above configuration would result in the following results being displayed:

1. Opened Issue PuneetGopinath/github-activity-readme#7
2. Closed Pull request PuneetGopinath/github-activity-readme#3
3. Merged Pull request PuneetGopinath/github-activity-readme#6
4. Opened Pull request PuneetGopinath/github-activity-readme#3
5. Opened Pull request PuneetGopinath/github-activity-readme#6

Describe alternatives you've considered
Only alternative would be to fork this and implement the changes myself, but I lack the knowledge to achieve this, so I won't risk anything here.

Additional context

[PuneetGopinath]

Nice request, Please open a issue in recent-activity repo