chore: Upgrade to twoxhash 2.1 and use oneshot API for improved performance

[andygrove]

Which issue does this PR close?

N/A

Rationale for this change

There is a new version of twoxhash that has a new oneshot API for use cases where all data is available at once. This is more performant than the streaming API.

Arrow uses this crate for hashing related to bloom filters.

We saw significant performance improvements in Comet with this approach, so hopefully it helps with arrow as well.

I tried benchmarking with write_batch benchmarks but am seeing highly variable results on my desktop, so I am not sure how to prove that this helps with performance.

What changes are included in this PR?

Are there any user-facing changes?

[viirya]

MSRV check failed.

[andygrove]

twoxhash defines rust-version as 1.81.0 even though it builds OK with much older versions. I will move this to draft for now.

FYI @shepmaster is it possible to lower the minimum rust version for twoxhash?

[shepmaster]

See also #6583

even though it builds OK with much older versions

I'm not sure I follow:

cargo +1.80 test --all-features

# ...

error: could not compile `twox-hash` (lib) due to 12 previous errors

[andygrove]

Closed since #6583 already exists. Thank you @shepmaster