feat(benches): add two new binaries to benchmark scaling

[imrn99]

Description

Scope: benches

Type of change: feat

Content description:

• add the grid-random-split binary. it generates a fixed size unit grid with each square cell having a diagonal split, the direction being random. the map is saved as a legacy VTK binary file
• add the cut-edges binary. it loads a a map from a VTK file, and divide its cells iteratively until a target edge size is reached. the input mesh is assumed to be a triangle mesh, we guarantee that each intermediate step and final result are as well
• add is_unused and is_unused_transac to basic map operations

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Project coverage is 84.85%. Comparing base (1a789a9) to head (d5bc868).

Files with missing lines	Patch %	Lines
honeycomb-core/src/cmap/dim2/basic_ops.rs	0.00%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #269      +/-   ##
==========================================
- Coverage   84.94%   84.85%   -0.10%     
==========================================
  Files          62       62              
  Lines        9407     9417      +10     
==========================================
  Hits         7991     7991              
- Misses       1416     1426      +10     

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