Add Endpoints for ICAT 5

[MRichards99]

Description:
ICAT 5 contains new entities that are not present in ICAT 4. Here's a full list of new entities:

• Affiliation
• DataCollectionInvestigation
• DataPublication
• DataPublicationDate
• DataPublicationFunding
• DataPublicationType
• DataPublicationUser
• DatasetInstrument
• DatasetTechnique
• FundingReference
• InvestigationFacilityCycle
• InvestigationFunding
• RelatedItem
• Technique

For each of these entities, there needs to be a new set of endpoints created for them. If we take Technique as an example, that will need (assume a /datagateway-api prefix at the start):

• /techniques/{id} - GET, PATCH, DELETE
• /techniques - GET, PATCH, POST
• /techniques/count - GET
• /techniques/findone - GET

The focus for now will be to implement these endpoints on the ICAT backend. I will ask whether this work needs to be done on the database backend too.

Acceptance criteria:

• For each entity, add in new endpoints of each type
• Ensure the new endpoints are listed in the OpenAPI interface and the openapi.yaml file has the new additions