Run OTel scenarios without Docker

[pmcollins]

Is your feature request related to a problem?
Running an OpenTelemetry scenario (e.g. an instrumented Python server, a client, and a Collector/Docker), then gathering the telemetry it produces, is a common requirement for testers, developers, and learners. Could this be made easier?

Describe the solution you'd like
Would like to be able to define all of the inputs of an OpenTelemetry scenario, point a tool at it, then have the outputs (telemetry) be available in the same place.

Describe alternatives you've considered
There is manual setup, and there's tooling like https://github.com/open-telemetry/opentelemetry-python/tree/main/tests/opentelemetry-docker-tests/tests and https://github.com/signalfx/splunk-otel-python/tree/main/tests/integration, which require Docker.

Additional context
I have a working prototype here.