Add early access support for new MAPI endpoint

[arguit]

Motivation

Enable customer to use early access version of new variant filter endpoint

Proposed solution

Add support for new endpoint, see here:
kontent-ai/management-sdk-net#284

Additional context

MAPI search/filtering:
https://kontent-ai.atlassian.net/browse/EN-525

Filter endpoint - SDKs:
https://kontent-ai.atlassian.net/browse/EN-542

[Enngage]

Implemented by #170

Published as pre-release 7.11.0-0