[MRG] fix lca summarize to support general collections for queries

[ctb]

This PR:

• adds a test for lca classify with a query zipfile
• fixes lca summarize to support any kind of query, not just JSON
• renames 3 tests in test_lca.py from test_lca_summarize to test_summarize for consistency's sake.

Addresses #1959.

[codecov]

Codecov Report

Merging #2107 (31fcf79) into latest (d212087) will increase coverage by 7.38%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           latest    #2107      +/-   ##
==========================================
+ Coverage   84.30%   91.69%   +7.38%     
==========================================
  Files         130       99      -31     
  Lines       15280    11004    -4276     
  Branches     2171     2171              
==========================================
- Hits        12882    10090    -2792     
+ Misses       2095      611    -1484     
  Partials      303      303              

Flag	Coverage Δ
python	91.69% <100.00%> (ø)
rust	?

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

Impacted Files	Coverage Δ
src/sourmash/lca/command_summarize.py	87.82% <100.00%> (ø)
src/core/src/ffi/storage.rs
src/core/src/ffi/index/mod.rs
src/core/src/encodings.rs
src/core/src/ffi/hyperloglog.rs
src/core/src/ffi/mod.rs
src/core/src/sketch/hyperloglog/estimators.rs
src/core/src/index/sbt/mod.rs
src/core/src/from.rs
src/core/tests/minhash.rs
... and 22 more

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[bluegenes]

this lgtm!