[New implementation] Refactor transform/detransform logic to be on the same component

[jeqo]

Transforms and detransforms are on different components (URSM and ChunkManager) atm. These are tightly related and should be on the same component.

Discussion: #206 (review)

[ivanyu]

I generally appreciate the motivation behind this, but would like to warn against making the code overly complex to achieve the goal if it comes to this. Let's stay practical :)

[jeqo]

Sure, no priority for this until we have the RSM implementation merged into the new-implementation branch.
Just keeping track of the discussion on #206, let's revisit later.