[MRG] Add a HLL implementation

[luizirber]

Implement a HyperLogLog sketch based on the khmer implementation but using the estimator from "New cardinality estimation algorithms for HyperLogLog sketches" (also implemented in dashing).

This PR also moves add_sequence and add_protein to SigsTrait, closing #1057.

The encoding data and methods (hp, dayhoff, aa and HashFunctions) was in the MinHash source file, and since it is more general-purpose it was moved to a new module encodings, which is then used by SigsTrait.

(these changes are both spun off #1201)

Checklist

• Is it mergeable?
• make test Did it pass the tests?
• make coverage Is the new code covered?
• Did it change the command-line interface? Only additions are allowed
  without a major version increment. Changing file formats also requires a
  major version number increment.
• Was a spellchecker run on the source code and documentation after
  changes were made?

[codecov]

Codecov Report

Merging #1223 into latest will decrease coverage by 0.87%.
The diff coverage is 68.54%.

@@            Coverage Diff             @@
##           latest    #1223      +/-   ##
==========================================
- Coverage   84.20%   83.33%   -0.88%     
==========================================
  Files          99      103       +4     
  Lines        9233     9609     +376     
==========================================
+ Hits         7775     8008     +233     
- Misses       1458     1601     +143     

Flag	Coverage Δ
rusttests	67.54% <68.73%> (-0.63%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/core/src/cmd.rs	86.88% <ø> (ø)
src/core/src/errors.rs	0.00% <0.00%> (ø)
src/core/src/ffi/hyperloglog.rs	0.00% <0.00%> (ø)
src/core/src/ffi/minhash.rs	0.00% <ø> (ø)
src/core/src/ffi/mod.rs	0.00% <ø> (ø)
src/core/src/ffi/signature.rs	0.00% <ø> (ø)
src/core/src/ffi/utils.rs	0.00% <0.00%> (ø)
src/core/src/from.rs	100.00% <ø> (ø)
src/core/src/lib.rs	100.00% <ø> (ø)
src/core/src/wasm.rs	0.00% <0.00%> (ø)
... and 15 more

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[ctb]

need this reviewed?

[luizirber]

need this reviewed?

it would be good to take a look, I tried to reproduce the Nodegraph API too when possible

[ctb]

This looks great, although I have not reviewed the Rust code in detail 👀

It looks like you do some encodings refactoring in the Rust code that is not mentioned in the PR. Maybe update the PR description a bit with that?