Update state_api.md to include key as a query parameter option.

[cr3ativ3cod3r]

What content needs to be created or modified?

The state management api docs should be updated to include that the key can be passed as query parameter in addition to the already existing path parameter approach.

Describe the solution you'd like

Add the query parameter approach to the docs, update URL parameters table, update examples section.

Where should the new material be placed?

dapr/docs/content/en/reference/api/state_api.md

The associated pull request from dapr/dapr, dapr/components-contrib, or other Dapr code repos

https://github.com/dapr/dapr/pull/8814

Additional context