Create unit tests into RestconfDataServiceImplTest to cover insert query parameter (used together with point) for POST and PUT requests.

Create tests for all values of insert parameter: first, last, before, after.

You can use jukebox module as is already done in test class.

Examples of the request: https://datatracker.ietf.org/doc/html/rfc8040#appendix-B.3.4 and https://datatracker.ietf.org/doc/html/rfc8040#appendix-B.3.5.

Expectations:

1. Model requests in Postman/other API tool first.
2. Create bugs for request which are not working.
3. Create 8 unit tests.
4. Add unit test which covers usage of LAST parameter (the default) and results in "data-already-exists" error.
5. Finally https://github.com/opendaylight/netconf/blob/4e6d5b5fb8c2aa9d428a9361d54f5113fb4f9a59/restconf/restconf-nb/src/main/java/org/opendaylight/restconf/nb/rfc8040/rests/transactions/RestconfStrategy.java#L357-L360C41 will be covered.