Implement analysis endpoints in octopus

[blairlyons]

Use case

As a developer working on real-time plots, I want websockets message types implemented in octopus to handle requests for metrics calculation.

Acceptance Criteria

A developer can, while testing locally:

• send Simularium spatial data and receive plot metrics back

Details

The Python package that handles analysis is here. See example script

new websockets message types for analysis:

• request available metrics: use MetricsManager.available_metrics(...)
• request plot with metrics IDs: use MetricsManager.plot_data(...)

everything on one port to start