[WIP] Added docs for RavenDB as State Store

[nmalocic]

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Description

Added documentation for RavenDB state store. Supported operations, and explanation to configuration.

Issue reference

Issue is in components-contrib repo

[mikeee]

https://github.com/dapr/components-contrib/pull/3702

[github-actions[bot]]

Stale PR, paging all reviewers

[msfussell]

@nmalocic - This PR will need to target the v1.16 docs branch (not the v1.15 branch)