Provide an asyncio Container

[meejah]

Currently, a "container" worker in crossbar can only support running Twisted components. It would be useful and fairly straightforward to provide an "asyncio" variant (that can run just asyncio components).

See also: #529 and crossbario/autobahn-python#812 (comment)

Probably a new option like "framework": "twisted" (the default) vs "framework: "asyncio" would make sense (for container workers).

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[OOPMan]

As a stop-gap until a proper asyncio Container worker is available, I have developed a method of running multiple asyncio components within a single Guest worker.

Further details available at https://github.com/opn-oss/autobahn-python-runners

[meejah]

We could also/instead have a container that works with both, by using the Twisted asyncioreactor