Enable proving cache and PDP piece size limit to 64GiB

[jennijuju]

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Improvement Suggestion

Cuz we can! 🎊

(needs to test performance wrt proving)

[snadrus]

Out of memory errors will occur on Proving big pieces until we have a resolution like the 100mb boxing idea @LexLuthr discussed.

[rvagg]

Shouldn't be OOM if snapshots get reliably saved. Maybe that's the challenge here - don't make it optional, don't have a fall-back to non-snapshot proof calculation for ~large pieces. Snapshot creation uses hashhash which is a streaming commp calculator, not an accumulator, and we upstreamed the snapshot extraction which got pulled back in in #1167. Once you have the snapshot, proof generation is pretty simple. In theory, with these pieces in place you should be able to go well above 64GiB and not sweat too much (I lifted that 64GiB limit in hashhash too, it's now basically uncapped).