Update fullquery swagger documentation

[nitrosx]

Description

This PR updates the fullquery swagger configuration for datasets, proposals and samples.
The fields parameter description and options have been updated to match the correct syntax for each one of them,

Motivation

The syntax and the subfields of the fields parameter was not clear for the fullquery endpoints of datasets, proposals, and samples

Fixes:

• added description for the fields parameters in the swagger configuration

Changes:

• datasets.controller
• proposals.controller
• samples.controlle
• common.utils

Tests included/Docs Updated?

• Included for each change/fix?
• Passing? (Merge will not be approved unless this is checked)
• Docs updated?
• New packages used/requires npm install?
• Toggle added for new features?

[Junjiequan]

Looks good to me.