MRG: adjust protein ksize for record/manifest

[bluegenes]

Protein k-mer sizes are k=k*3 internally, but k in a manifest.

Record is used within manifest, so should reflect k.

This should not impact selection at sig level. Insignature::Select:

 valid = if let Some(ksize) = selection.ksize() {
                let k = s.ksize() as u32;
                k == ksize || k == ksize * 3

So here we match exact ksize or k=k*3, regardless of ksize or molecule type. This is b/c we don't have access to is_protein or any other property unless we load the minhash.

we may want to be more explicit at some point, but this solves the immediate problem

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (484c7ea) 86.70% compared to head (45a7ad8) 86.71%.

Additional details and impacted files

@@           Coverage Diff           @@
##           latest    #3019   +/-   ##
=======================================
  Coverage   86.70%   86.71%           
=======================================
  Files         135      135           
  Lines       15395    15396    +1     
  Branches     2624     2624           
=======================================
+ Hits        13349    13350    +1     
  Misses       1745     1745           
  Partials      301      301           

Flag	Coverage Δ
hypothesis-py	25.56% <ø> (ø)
python	92.85% <ø> (ø)
rust	59.88% <100.00%> (+0.01%)	⬆️

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[bluegenes]

ready for review @sourmash-bio/devs