Teach flywire_cave_query about query filter dicts

[jefferis]

• convert R lists to python dicts using cavedict_rtopy
• with test

[codecov[bot]]

Codecov Report

Merging #162 (651651d) into master (b15e710) will increase coverage by 0.06%. The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master     #162      +/-   ##
==========================================
+ Coverage   49.84%   49.91%   +0.06%     
==========================================
  Files          33       33              
  Lines        3956     3963       +7     
==========================================
+ Hits         1972     1978       +6     
- Misses       1984     1985       +1     

Impacted Files	Coverage Δ
R/cave.R	62.30% <88.88%> (+1.33%)	:arrow_up:

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