Additional KEGG Prefixes

[cthoyt]

Motivated by prefixcommons/prefixes#4 and prefixcommons/prefixes#2, this PR adds records for:

• KEGG Reaction Class
• KEGG Drug Group

[codecov-commenter]

Codecov Report

Merging #374 (22ba99e) into main (046fe81) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #374   +/-   ##
=======================================
  Coverage   34.47%   34.47%           
=======================================
  Files          95       95           
  Lines        4893     4893           
  Branches      980      980           
=======================================
  Hits         1687     1687           
  Misses       3107     3107           
  Partials       99       99           

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