feat: add CreateRole and DropRole command completions

[joeyhage]

No description provided.

[codecov]

Codecov Report

Merging #714 (4c5fd36) into main (f67acee) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #714      +/-   ##
==========================================
+ Coverage   84.98%   85.00%   +0.01%     
==========================================
  Files         124      124              
  Lines        1645     1647       +2     
  Branches      133      130       -3     
==========================================
+ Hits         1398     1400       +2     
  Misses        247      247              

Impacted Files	Coverage Δ
...s/core/shared/src/main/scala/data/Completion.scala	100.00% <ø> (ø)
...d/src/main/scala/net/message/CommandComplete.scala	89.36% <100.00%> (+0.47%)	⬆️

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[mpilquist]

Thanks!