Use metafeature groups for filtering

[JeremyRees]

Resolves #195. In PR #192 the enum MetafeatureGroup was introduced for tagging metafeatures. This PR tags target-dependent metafeatures as such and leverages the new groups for filtering in Metafeatures.list_metafeatures() and Metafeatures.compute(), with appropriate new unit tests included.

[codecov-io]

Codecov Report

Merging #204 into develop will increase coverage by 0.01%.
The diff coverage is 93.75%.

@@             Coverage Diff             @@
##           develop     #204      +/-   ##
===========================================
+ Coverage    92.23%   92.24%   +0.01%     
===========================================
  Files           13       13              
  Lines          747      761      +14     
===========================================
+ Hits           689      702      +13     
- Misses          58       59       +1

Impacted Files	Coverage Δ
metalearn/metafeatures/landmarking_metafeatures.py	100% <ø> (ø)	⬆️
metalearn/metafeatures/simple_metafeatures.py	100% <ø> (ø)	⬆️
...metafeatures/information_theoretic_metafeatures.py	95.34% <ø> (ø)	⬆️
...talearn/metafeatures/decision_tree_metafeatures.py	100% <ø> (ø)	⬆️
metalearn/metafeatures/base.py	93.61% <100%> (ø)	⬆️
metalearn/metafeatures/metafeatures.py	95.55% <93.1%> (-0.18%)	⬇️

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