Option to disable websockets? (Websocket protocol import is slow)

[benharris-conversica]

I was doing some profiling to try to speed up my lambda cold starts when I noticed mangum.protocols.websockets is taking up the majority of the import time for Mangum (0.25s / 0.4s total on my system, see below for details). I'd like to be able to disable this import to speed things up. Is it possible to do something like #197 to make websocket support optional?

Profiling details (using https://github.com/nschloe/tuna to visualize):

python -X importtime -c 'from mangum import Mangum' 2> mangum.log
tuna mangum.log

[jordaneremieff]

@benharris-conversica websocket support was removed. You can upgrade your version to avoid this.

[benharris-conversica]

Whoops, I was looking on the releases page on https://mangum.io/, didn't realize there was a newer version. I can confirm this fixes the issue for me, mangum loads 2x faster in the latest version: