[EXP] explore alternative MinHash constructors, and other things.

[ctb]

PR into #1508 for the moment, building off of FrozenMinHash work. It's not clear how much of this has to wait for v5, but I think we can do a lot with new constructors and not necessarily breaking or removing old ones.

In brief, add new MinHash constructors (at the Python level) for NumMinHash and ScaledMinHash

• ref separate num and scaled MinHash classes should we eliminate num MinHashes? (no) #1354
• better __init__ MinHash initialization #338

Explore other ideas -

• enums for moltype consider enums for moltype/hash_function #952 update MinHash attributes/properties for consistency, and/or switch to using moltype attribute #1136 can we just use the hash function to flag incompatible signatures, instead of DNA/protein/etc? #751
• look into add_sequence changes add_sequence method for MinHash #186
• and better protein API Document and/or improve protein MinHash API. #720
• improved num behavior update 'num' behavior, in terms of downsampling and comparison checking #870
• keep an eye on settle on core MinHash object API #885
• more API breaking with the is_ functions update MinHash attributes/properties for consistency, and/or switch to using moltype attribute #1136
• clean up max_hash stuff per remove sourmash.MAX_HASH? #1300 and Remove max_hash from Minhash.__init__ #1303

[codecov]

Codecov Report

Merging #1510 (0426915) into add/immutable_minhash_countergather (8457daf) will decrease coverage by 0.07%.
The diff coverage is 71.15%.

@@                           Coverage Diff                           @@
##           add/immutable_minhash_countergather    #1510      +/-   ##
=======================================================================
- Coverage                                95.22%   95.15%   -0.08%     
=======================================================================
  Files                                       99       99              
  Lines                                    17485    17537      +52     
  Branches                                  1590     1597       +7     
=======================================================================
+ Hits                                     16650    16687      +37     
- Misses                                     606      614       +8     
- Partials                                   229      236       +7     

Flag	Coverage Δ
python	95.15% <71.15%> (-0.08%)	⬇️

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Impacted Files	Coverage Δ
src/sourmash/minhash.py	86.91% <46.42%> (-3.01%)	⬇️
tests/test_minhash.py	99.75% <100.00%> (+<0.01%)	⬆️

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[ctb]

review #999 (comment)