prepare POCS for a filterwheel mode

[lspitler]

Modify POCS to accommodate Filterwheels.

Describe the solution you'd like

Here are the tasks for prepping a camera for a filterwheel:

• In filter_wheel.config, for each filterwheel require a filter_wheel configure to have a default_filter_name taht will be used if someone doesn't speicify filter_name in targets.yaml
• Modify the camera initialisation so it sets up a filterwheel.

Here are the tasks for prepping a single observation of a target:

• when stepping through e.g. target.yaml each target can have an optional filter_name key/name that specifies the desired filter for a target
• Modify target.yaml parser to accommodate the filter_name key.
• Modify Observation class to add an optional filter_name arg to scheduler.observation.Observation.
• In camera.take_observation, if filter_name was specified and if filter_wheel_exists=True, then run camera.move_to(filter_name)

Related Issues/PRs
If there are any related Issues or PRs list them here:

Depends on: #940

[danjampro]

"Modify target.yaml parser to accommodate the filter_name key."

I believe this is done automatically in pocs.scheduler.scheduler.add_observation

Also by targets.yaml, we are referring to the value of fields_file in the config

May also be good to add filter_name to metadata / filename?

[AnthonyHorton]

Modify the camera initialisation so it sets up a filterwheel.

Not necessary, that code has been there a while. There just needs to be a filterwheel configuration in the camera config.

[wtgee]

@danjampro and @AnthonyHorton how is this Issue in relation to the work that has been done?