Remove nest_asyncio from bittensor to allow uvloop support

[mjurbanski-reef]

Is your feature request related to a problem? Please describe.

Uvloop, which provides supperior speed, does not allow loop nesting.

It is also the case that uvloop is pulled in by popular packages, which forces some subnets develop hacks to combat this.

And perhaps more importantly, https://github.com/erdewit/nest_asyncio seems to have been abandodend

Describe the solution you'd like

Remove nest_asyncio, and let bittensor users decide which asyncio loop they want to run. Perhaps even suggest (not mandate) running uvloop, since it consistently shows better results in benchmarks than CPython asyncio stdlib loop.

Seems like there was some attempt of this in the past #1501 for some reason (?)

Describe alternatives you've considered

No response

Additional context

No response