feature: `otel collect` subcommand

[esnible]

Feature Description

For #37

The K8s Rossoctl installs an OTel collector with special configuration. We would like to be able to collect traces using the same configuration without Kubernetes.

Proposed Solution

A developer should be able to run mlflow server --host 0.0.0.0 --port 5001 to start MLflow, then rossoctl otel collect --mlflow-port=5001 to start an otel/opentelemetry-collector-contrib:latest pod with a configuration equivalent to the K8s Rossoctl collector.

Alternately, we should be able to run rossoctl otel collect --config=<filename> to run an arbitrary forwarder.

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Additional Context

If MLflow isn't listening on the port already, we should create a message such as

No MLflow listening on port 5001, run `mlflow server --host 0.0.0.0 --port 5001` to start.

See https://mlflow.org/docs/latest/ml/tracking/quickstart/ for instructions on obtaining the MLflow CLI.
Note that on MacOS, the default MLflow port 5000 is used for Control Center and AirPlay, so we recommending port 5001.