Introduce internal transaction-like API for element mutations

[Mrazator]

Within a certain action, we should have UoW-like possibilities for doing everything (in a transaction) or doing nothing (rollback to the previous state), so that we don't end up in an inconsistent state in between mutations.

1. Either perform all mutations or none (perform a rollback)
2. Don't allow mutating one element multiple times within the same transaction (~limit unnecessary version bumps)

The first step towards mimicking such behavior was done in #7348 as part of the applyTo logic, where either all increments are applied or none (while rolling back to prevElements). Check the details inside:

excalidraw/packages/excalidraw/change.ts

Line 1069 in c1a3b89

// mimic a transaction by applying deltas into `nextElements` (always new instance, no mutation)