Add searching and sorting capabilities to API Connect platform APIs

API Connect Provider and Consumer APIs, as described in https://apic-api.apiconnect.ibmcloud.com/v10/#/documentation/introduction provide GET operations to retrieve e.g. all products, apis or applications.

While these operations support pagination and selection of fields to be returned there is no way to search/filter to retrieve only a relevant subset of resources.

Please add filtering and sorting capabilities to all endpoints that return large result sets (collections of resources).

This should allow for implementing use cases like

1. return only objects with title or name following a given naming pattern

2. return only objects that have been created or updated within a given time span

3. return only objects where certain attributes, e.g. state, version, api_type have a certain value

4. sort result list based on any attribute of the result list, e.g. object name, creation date, updatedDate or object version

Ressources we are most interested in are Products, Apis, Applications, Consumer organizations, Subscriptions, Spaces

BTW: this could also help with handling large result sets (e.g. catalogs with hundreds of spaces and a thousand products per catalog) in the API Manager UI and allow searching on the server side and not in the UI.

After having selected the desired subset of objects, we want to retrieve the details of each object.

To do that efficiently, it would be great if the endpoints support http caching headers, e.g. ETags.