feat(bench): add benchmarking tools for the grid building routines

[imrn99]

add:

• a python script
• two benchmarks, one fixed size, one ver a range of grid sizes
• a binary to profile using perf / heaptrack / ...

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.51%. Comparing base (1eb96db) to head (4b31a11).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #194 +/- ## ======================================= Coverage 81.51% 81.51% ======================================= Files 36 36 Lines 5329 5329 ======================================= Hits 4344 4344 Misses 985 985 ```

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