Document new coherence state store component

[tmiddlet2666]

This is an issue to create documentation for the new coherence state store component, once it is approved in components-contrib

[cicoyle]

Hey @tmiddlet2666 - mind creating the docs PR targeting the 1.16 branch for the implementation changes from your PR? :)

[cicoyle]

Note for the future: When the docs PR gets reviewed we will want to ensure this link resolves: https://github.com/dapr/components-contrib/pull/3838/files#diff-4457c8aa0a6475d6e80ecb8acee3906c268ef2da8af236ffc9a23911d006a104R10

[msfussell]

Resolved.