Prioritize Mech Sectors

[Strepto]

What have I made? 👩‍💻

This adds priority sectors for MECH. This MAY be costly, so lets see how many sectors this produces on large assets.

How can you best review this? 🧐

Read and critique the selection methods I have picked for MECH.

Did I remember everything checklist?

• I made some awesome changes! 😎
• I left the code in a better state than when I started working on it ✨
• I wrote unit and/or integration tests 👾
• I have considered any security implications, and requested review of them explicitly 🔐
• I verified that it checks the acceptance criteria. 📜
• I have tested this change in the Echo DEV environment, or requested someone to test it for me 🚀
• I updated the documentation/readme 📚
• I made the PR title descriptive and human-readable 👨‍👩‍👦‍👦
• Existing unreported issues I found but could not fix was added as a new Issues 🚧