add mistral completion API

[batmac]

No description provided.

[codecov]

Codecov Report

Attention: 34 lines in your changes are missing coverage. Please review.

Comparison is base (acb7be2) 58.10% compared to head (4974555) 57.94%.

Files	Patch %	Lines
pkg/mutators/single/mistral.go	48.48%	31 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #527      +/-   ##
==========================================
- Coverage   58.10%   57.94%   -0.17%     
==========================================
  Files         102      103       +1     
  Lines        3812     3878      +66     
==========================================
+ Hits         2215     2247      +32     
- Misses       1347     1378      +31     
- Partials      250      253       +3     

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