various upgrades and fixes

[ctb]

• adds a require_exist option to BBHashTable.get_unique_values that will raise exception for missing items
• fixes BBHashTable.get_unique_values to take any iterable
• fixes PyMPHF.lookup_many to take any iterable

[codecov[bot]]

Codecov Report

Merging #13 into latest will increase coverage by 5.48%. The diff coverage is 97.22%.

@@            Coverage Diff             @@
##           latest      #13      +/-   ##
==========================================
+ Coverage   69.93%   75.41%   +5.48%     
==========================================
  Files           5        5              
  Lines         143      179      +36     
==========================================
+ Hits          100      135      +35     
- Misses         43       44       +1     

Impacted Files	Coverage Δ
test_table.py	99.09% <96.15%> (-0.91%)	:arrow_down:
test_bbhash.py	89.28% <100.00%> (+5.95%)	:arrow_up:

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