Add benchmark workflow.

[codecov-commenter]

Codecov Report

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

Project coverage is 95.15%. Comparing base (8bb7d38) to head (f168af2).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #262 +/- ## =========================================== + Coverage 95.13% 95.15% +0.02% =========================================== Files 49 49 Lines 33190 33190 =========================================== + Hits 31574 31582 +8 + Misses 1616 1608 -8 ```

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