Benchmarks for seq_to_hashes in protein mode

[luizirber]

Add some rust benchmarks for seq_to_hashes in protein mode, so we don't regress after the awesome progress in #1938

Other fixes:

• Default python in asv to the one where asv is running (fixes benchmark cmd tox -e asv requires python=3.10 #1937)
• Make ComputeParameters initliazer use explicit keywords (and fix __repr__)

[ctb]

LGTM!!

[codecov]

Codecov Report

Merging #1944 (a6e0297) into latest (03f504e) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           latest    #1944   +/-   ##
=======================================
  Coverage   82.93%   82.93%           
=======================================
  Files         125      125           
  Lines       13755    13755           
  Branches     1877     1877           
=======================================
  Hits        11408    11408           
  Misses       2075     2075           
  Partials      272      272           

Flag	Coverage Δ
python	90.96% <100.00%> (ø)
rust	65.13% <ø> (ø)

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Impacted Files	Coverage Δ
src/sourmash/command_compute.py	92.87% <100.00%> (ø)
src/sourmash/command_sketch.py	93.29% <100.00%> (ø)

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