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

[dmitsh]

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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.