state store query API: validate changes in the syntax of query JSON

Per work items below, the syntax of the state query JSON has been slightly changed, to make it more intuitive:
https://github.com/dapr/components-contrib/issues/1490
https://github.com/dapr/components-contrib/pull/1491
https://github.com/dapr/components-contrib/pull/1500
https://github.com/dapr/docs/pull/2195

Please validate this change in the SDK, and fix if necessary.