feat(generator/rust): implicit LROs mixin

[coryan]

Fixes #781 (yes, second time)

If you are wondering how this can possible work: for services with /v1 in the path, the default rules inherited from the mixin work just fine.

I wonder if we should mixin all the methods. Thoughts?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.57%. Comparing base (25149ad) to head (bb574ae).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #852   +/-   ##
=======================================
  Coverage   95.57%   95.57%           
=======================================
  Files          36       36           
  Lines        1357     1357           
=======================================
  Hits         1297     1297           
  Misses         60       60           

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