feat: update workflow to give labels

[0xZaddyy]

PR Description

Add automated PR labeling system

This PR introduces an automated labeling system for pull requests based on which crates are modified. The system will apply appropriate labels (e.g., C-client, C-node, C-types) to PRs automatically as they are opened or updated.

Changes included:

1. Added manage-pr.yml workflow file that:

   • Triggers on PR events (opened, synchronized, reopened)
   • Checks out both the base branch and PR merge commit
   • Dynamically generates a label configuration
   • Applies appropriate labels using the GitHub labeler action

2. Added gen-label.sh script in the contrib/ folder that:

   • Scans the repository for crates
   • Generates a label configuration file mapping paths to labels
   • Includes safety checks to prevent accidental overwrites

[tcharding]

Thanks for working on this! One problem with this type of PR is we don't know if it works until after it is triggered. Would you consider merging this into master on your own tree then raising a PR against your tree and then we can see if this works?

[tcharding]

Oh and since it looks like a bunch of this is from rust-bitcoin can you please put that in the commit log.

[0xZaddyy]

Alright sir, i will do all these now.

[tcharding]

Thanks man, hit me with a link when you have it all working.