Return simple dict for SPIM Imaging workflow

[mekhlakapoor]

Is your feature request related to a problem? Please describe.
SLIMS SPIM Imaging workflow only contains a portion of required fields for an Imaging Acquisition model.

Describe the solution you'd like
Only return relevant fields in SPIM Imaging workflow dictionary instead of models from SLIMS. Relevant fields include:

• subject_id
• specimen_id
• experimenter name/surgeon
• instrument_id
• chamber immersion medium
• chamber refractive index
• sample immersion medium
• sample refractive index
• x_direction
• y_direction
• z_direction.

Additional context
We will be returning the dictionary as is in the metadata-service.