Add specimen procedures from SLIMS Histology workflow

[dyf]

The procedures endpoint needs to integrate specimen procedures from the SLIMS Histology workflow.

Acceptance criteria

• an API exists for fetching metadata from the SLIMS Histology workflow called slims_histology.
• the procedures API integrates this information, mostly as specimen_procedures.

[mekhlakapoor]

We should probably break this issue up:
(1) Get SLIMS response in aind-slims-api.
(2) Add endpoint 'specimen_procedures' that maps slims response to specimen procedures in aind-metadata-service
(3) Integrate this information in the procedures endpoint

NOTE: Let's first figure out how this data is stored in SLIMS, and map out whether we'll need an operation class with multiple API calls