Vendor JS Libs

[blopker]

This PR vendors the JS libraries. This is useful so users of this package don't have to rely on third party CDNs which is against many companies' security policies and adds another failure point to sites. If people want to use other versions of the vendored libs or want to create their own JS bundle, it should be easy enough to just not include the head.html template and use their own solution.

List of changes:

• Changed chat app setup instructions to use Python 3's built in venv module so we don't rely on the virtualvenv package being installed globally.
• Added some seed data to the chat app so people can get set up easier.
• Removed channels from install_requires so people using WSGI don't need to have it installed. We'll want to mention something about installing it in the Streams install instructions.
• Moved the previously inline JS into its own JS file, then wrapped it in IIFE so variables don't leak. We can minify this at some point, but it's so small now it didn't seem worth it.
• Changed turbo.js to load the es2017 version as our custom JS wont work on es5 anyway.
• Changed reconnecting-websocket to the IIFE version minified which is smaller and avoids an exception with the CJS version.
• Used the static tag with data-turbo-track="reload" so the JS files get fingerprinted and Turbo reloads itself when those resources change in production.
• Added defer to script tags so they don't block rendering the rest of the page.
• Dynamically create the websocket URL to work in other environments besides localhost, also now supports secure connections.

[blopker]

Thanks for the review @davish! I'm part of this org now, but still can't merge this PR. Can you add me to this repo? If you make me an admin I can help add people too as needed.

[davish]

Hmm... I also don't have admin access but I can merge, since I think I asked @C4ptainCrunch to make me a maintainer. @C4ptainCrunch could you add @blopker to the maintainer list so he can merge the PR? I can also merge this one in myself

[blopker]

Ah, too bad! If you could, please go ahead and merge this so we can move forward. It would be good to get admin access for one or both of us for this repo so we can set up things like GitHub actions.

[C4ptainCrunch]

You are now both in the @hotwire-django/maintainers team that should grant you almost every access on turbo-django, stimulus-django and hotwire-django :)