Client-Side Python Components

[Archmonger]

Description

This PR backports client-side python components from reactpy-django into reactpy.

The interface is largely the same, however, this PR also adds a way of configuring ReactPy via PyScript as a standalone application.

Issues Resolved

• fix Client Side Python Components #110

Follow Up Issue

• Configuring "packages" to a local wheel causes dependency resolution failure pyscript/pyscript#2282

Changelog

• Add template tags for rendering pyscript components
• Add pyscript_component component to embed pyscript components into standard ReactPy server-side applications
• Create new ASGI app that can run standalone client-side ReactPy
• Convert all ASGI dependencies into an optional reactpy[asgi] parameter to minimize client-side install size
• Start throwing 404 errors when static files are not found

Checklist

Please update this checklist as you complete each item:

• Tests have been developed for bug fixes or new functionality.
• The changelog has been updated, if necessary.
• Documentation has been updated, if necessary.
• GitHub Issues closed by this PR have been linked.

_{By submitting this pull request I agree that all contributions comply with this project's open source license(s).}