New API in ESAP back end that returns a list of data-product types.

When querying for data in the Science Gateway, the users will expect to be able to search only for the data-product types they are interested in (i.e. images, cubes, spectra, etc). By adding an additional API that returns a list of data-product types for a given simple-cone search (RA, dec, radius) we will allow the front end to separate the query results onto different tabbed pages, and also provide a data-product-type filter in the search filter box.

AC1: A new API is added to the ESAP back end that queries the DaCHS TAP service by RA, dec, and radius, and returns a list of data-product types that are found within the search results.

AC2: The existing API in the ESAP back end that implements the DaCHS TAP service query has been amended to allow data-product type to be supplied as a query parameter.

AC1: The new FastAPI backend (SP-4159) has been deployed to https://esap.srcdev.skao.int/tannet-api/v1/www/docs/oper, and includes the new endpoint /data/get_product_types (see screenshot attached).

The new end point accepts ra, dec, and radius, and returns a list of data-product types from the DaCHS TAP service.

AC2: The ESAP back end did not require any modification to accept the data-product type as a query parameter - this functionality was already there. The front end has been modified to add the data-product type to the query parameters when querying the DaCHS Tap service (see screenshot attached).