perf: avoid all default web3 middleware

[antazoey]

What I did

You can avoid all the middleware completely from web3 if you do middleware=[] at the initialization sequence.

I didn't really see much of a performance gain btw

How I did it

middleware=[] at the initialization sequence

How to verify it

[x for x in web3.middleware_onion] is empty now, isn't before.

Checklist

• All changes are completed
• Change is covered in tests
• Documentation is complete