fix: json creator for QueryStatusCount should match getter (MINOR)

[vcrfxia]

Description

The QueryStatusCount getter returns Map<KsqlQueryStatus, Integer> but the creator expects Map<KafkaStreams.State, Integer> which means deserialization fails for KsqlQueryStatus.UNRESPONSIVE since that's not a valid KafkaStreams.State:

Caused by: com.fasterxml.jackson.databind.exc.InvalidFormatException: 
Cannot deserialize Map key of type `org.apache.kafka.streams.KafkaStreams$State` from String "UNRESPONSIVE": not a valid representation, problem: (com.fasterxml.jackson.databind.exc.InvalidFormatException) Cannot deserialize Map key of type `org.apache.kafka.streams.KafkaStreams$State` from String "UNRESPONSIVE": not one of the values accepted for Enum class: [CREATED, NOT_RUNNING, RUNNING, ERROR, REBALANCING, PENDING_SHUTDOWN]

This PR updates the creator to match the getter.

Testing done

Added unit test.

Reviewer checklist

• Ensure docs are updated if necessary. (eg. if a user visible feature is being added or changed).
• Ensure relevant issues are linked (description should include text like "Fixes #")

[stevenpyzhang]

lgtm, thanks!