Added hisat2 component

[PhilPalmer]

This change is 

[codecov-io]

Codecov Report

Merging #213 into master will increase coverage by 0.07%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #213      +/-   ##
==========================================
+ Coverage   41.95%   42.03%   +0.07%     
==========================================
  Files          72       72              
  Lines        6461     6469       +8     
==========================================
+ Hits         2711     2719       +8     
  Misses       3750     3750

Impacted Files	Coverage Δ
flowcraft/generator/components/mapping.py	100% <100%> (ø)	:arrow_up:

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