OPEN-37 Add new command, schedule and PR functionality

[jmetrikat]

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Description

This PR implements the following state machine triggered by:

Commands to the bot

• “@any assign me”: works only for “New” issues, changes status to “In progress”, assignes @any-association to the issue, saves comment’s author name to “Lead contributor”

• “@any unassign me”: works only for “In progress” issues, changes status to “New”, removes assignee, removes the content of “Lead contributor”

Timer, works only for “In progress” issues

• on the 6th day of inactivity in the issue posts a comment with the message “@{lead-contributor}, please confirm that you’re still working on this by commenting this issue”

• on the 7th day of inactivity in the issues posts a comment with the message “@{lead-contributor}, the issue is now available for other contributors due to inactivity”, changes status to “New”, removes assignee, removes the content of “Lead contributor”

Events related to PRs

• works only for “In progress” issues, if PR is linked, then changes status to “In review”

• works only for “In review” issues, if PR is unlinked, then changes status to “In progress”

• works only for “In review” issues, if PR is closed without merging, then changes status to “In progress”

• works only for “In review” issues, if PR is merged, then changes status to “Done”

What type of PR is this? (check all applicable)

• 🍕 Feature
• 🐛 Bug Fix
• 📝 Documentation Update
• 🎨 Style
• 🧑‍💻 Code Refactor
• 🔥 Performance Improvements
• ✅ Test
• 🤖 Build
• 🔁 CI

Related Tickets & Documents

Mobile & Desktop Screenshots/Recordings

Added tests?

• 👍 yes
• 🙅 no, because they aren't needed
• 🙋 no, because I need help

Added to documentation?

• 📜 README.md
• 📓 tech-docs
• 🙅 no documentation needed

[optional] Are there any post-deployment tasks we need to perform?