Automate HIP Management with Number Assignment and Status Updates

[mgarbs]

Description:

This PR introduces two automated GitHub Actions workflows to streamline the management of HIPs (Hedera Improvement Proposals):

1. Assign HIP Number and Rename File:

   • This workflow identifies new HIP proposals by comparing the files modified in a pull request (PR) against the main branch.
   • If a new HIP is detected (a proposal that doesn't yet exist in the main branch), the workflow assigns a unique HIP number based on the PR number.
   • It renames the file following the standard format (hip-<PR_NUMBER>.md) and updates the hip: field in the document header with the assigned number.
   • Finally, it commits the changes back to the PR branch for a clear, consistent HIP file structure.

2. Schedule Status Update Based on Last Call Time:

   • This workflow automatically updates the status of HIPs that have reached their last call deadline.
   • It identifies merged PRs containing HIP files marked with a status: Last Call field.
   • The workflow calculates the appropriate delay until the specified last-call-date-time, and then applies the correct new status based on the HIP type and category.
   • It also adds or updates the updated field with the current date.
   • After making these adjustments, it creates a new PR for the changes and automatically merges it.

Benefits:

• Automation: Streamlines HIP management, saving time and reducing manual errors.
• Consistency: Ensures all new and updated HIPs adhere to a consistent naming and status convention.
• Transparency: Offers clear communication through automatic PR messages and the precise updating of statuses and dates.