ENH: add kraken2 types and formats

[misialq]

Adds two formats/types:

• one for storing Kraken2 reports
• another one for storing Kraken2 outputs

[codecov[bot]]

Codecov Report

Merging #35 (caaeadd) into main (f9bc552) will decrease coverage by 0.18%. The diff coverage is 94.77%.

@@            Coverage Diff             @@
##             main      #35      +/-   ##
==========================================
- Coverage   96.01%   95.82%   -0.19%     
==========================================
  Files          25       30       +5     
  Lines         752      886     +134     
==========================================
+ Hits          722      849     +127     
- Misses         30       37       +7     

Impacted Files	Coverage Δ
q2_types_genomics/kraken2/_format.py	89.13% <89.13%> (ø)
q2_types_genomics/kraken2/tests/test_type.py	94.11% <94.11%> (ø)
q2_types_genomics/kraken2/tests/test_format.py	98.21% <98.21%> (ø)
q2_types_genomics/__init__.py	100.00% <100.00%> (ø)
q2_types_genomics/kraken2/__init__.py	100.00% <100.00%> (ø)
q2_types_genomics/kraken2/_type.py	100.00% <100.00%> (ø)
q2_types_genomics/plugin_setup.py	100.00% <100.00%> (ø)

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