Feature/esckan-35 - Composer REST new generic endpoint

[D-GopalKrishna]

Jira Card - https://metacell.atlassian.net/browse/ESCKAN-35

A new generic endpoint for Connectivity statement.

• Add new endpoint connectivity-statement-generic with new serializer - GenericConnectivityStatementSerializer and filterset - GenericConnectivityStatementFilter.
• Only GET allow.
• filter by 4 query parameters - origin, via, destination, population uris
• Only exported Connectivity statements are shown. As mentioned in lucidcharts

Default behaviors of the filters.

• When multiple population uris are selected - OR is applied.
• When one population and one via/origin/destination is selected - AND is applied

Source on Custom Filter with django_filters

Short video demo

https://github.com/MetaCell/sckan-composer/assets/59233227/24cedd2b-7fc7-4530-b103-cf46acceb40c

[D-GopalKrishna]

@ddelpiano can you please confirm the format of the Response here -

response_1711968948434 (1).json

Based on the filters here - https://www.figma.com/file/j5q1LPeH9wqX2S5TjitT40/SCKAN-Explorer-UI?type=design&node-id=842-21589&mode=dev

[D-GopalKrishna]

Will be creating a new PR for #ESCKAN-35 - generic composer API.

[zsinnema]

@D-GopalKrishna when will you create the PR for #ESCKAN-35?