Feat: Add codspeed for benchmarking

[pcriadoperez]

• Adds codspeed
• Adds benchmark test for ws_get_order_book

Steps to merge PR:

1. create an account in https://codspeed.io/ (It's free for public repos)
2. Save token in gihtub secrets ${{ secrets.CODSPEED_TOKEN }}

[coveralls]

coverage: 66.971% (+0.02%) from 66.953%
when pulling 28c5486 on pcriadoperez:codspeed
into 80e1ff5 on sammchardy:master.