Adding query parameters to filter get API calls
Fixes#92
Adding MultiValueMap in the BaseService class to ensure that all controllers support query parameters for the GET API call. Each service will have to handle this independently though. There is no generic default implementation for handling query parameters as of now.
In the Plugin APIs handling the filtering of fetching plugins specifically by type. This should be used as a template implementation to create a generic implementation of this nature to query the db generically for a list of given fields and values. Will make future API implementations much simpler.
See merge request theappsmith/internal-tools-server!91