Feature Request: Revenant Rework/Expansion

[slarticodefast]

It's currently somewhat uninteresting and has much more potential to be more engaging.

This will need a design doc first so that we can agree in which direction to go with this.
A few proposals have been declined so far, but @Princess-Cheeseballs wanted to compile them into a single good one from the notes we took in the maintainer doc meetings. More details will be added to this issue once a doc is merged.

See previous design docs

• Specter antagonist docs#262
• Revenant Remake docs#216
• Shade Antagonist docs#100
• Revenant V2 docs#325
• Revenant Minor Antagonist Design Document docs#597

and relevant PRs

• Revenants can buy the ability to grab and pull things #42592
• Freshen Up the Revenant Minor Antagonist to Enhance Spookage and Halloween Vibes #40671