feat(bench): add fetch_... methods benchmarks

[imrn99]

add a benchmark group dedicated to the following CMap2 methods:

• fetch_vertices
• fetch_edges
• fetch_faces

I'm adding those to quantify an optim I thought of. I'll implement the optim in another PR, but we're looking at a 30% decrease of exec time in sequential; & the new impl can be parallelized once #201 lands

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.06%. Comparing base (cb94f27) to head (0a54c72).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #202   +/-   ##
=======================================
  Coverage   82.06%   82.06%           
=======================================
  Files          41       41           
  Lines        5625     5625           
=======================================
  Hits         4616     4616           
  Misses       1009     1009           

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