[WIP][DNM] Initial investigations into Late Locking #507
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Purpose of this PR is just to explore what we've been calling 'Lock-free transactions` but I think I'm going to just call 'Late Locking' for now, first outlined here https://forum.grin.mw/t/mostly-lock-free-transactions/7313. Will likely require an RFC if we aim to put this in production.
Preliminary work for this was done pre-HF4, so this is just an exploration of how easily it will be to implement and see what issues might come up. From what I can gather now, deciding how to handle the fee is the largest unknown.
WIP, and doesn't yet work, hoping to bring this to a point where a late-lock workflow is implemented in tests.