asv benchmarking to use mamba

This will save some significant time.
However
1. current release of asv dosent include mamba support
2. how to use mamba with asv is also very opaque, I could not get it to work for their master branch

Start by examining the ASV benchmarking setup and checking the current ASV release and its master branch for mamba support. Done means the project's benchmarks run under mamba and the setup reduces environment or benchmark time as intended.

Written by the indexing model from the issue text.