mysql_user: Add SHOW_ROUTINE privilege support

[Andersson007]

SUMMARY

Fixes #86

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

plugins/modules/mysql_user.py

[codecov]

Codecov Report

Merging #87 (3a869e7) into main (9eb0079) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #87   +/-   ##
=======================================
  Coverage   72.33%   72.33%           
=======================================
  Files           9        9           
  Lines        1605     1605           
  Branches      420      420           
=======================================
  Hits         1161     1161           
  Misses        298      298           
  Partials      146      146           

Impacted Files	Coverage Δ
plugins/modules/mysql_user.py	70.68% <ø> (ø)

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[Andersson007]

the change is trivial, so it's acceptable to merge without review