JSON.GET never returns an array #3711

[tishun]

Deprecate the wrong API and provide a new one, based on how the JSON.GET works.

Closes #3711

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Note

Medium Risk
Introduces new jsonGetValue* methods and deprecates existing jsonGet* list-returning APIs, which can impact downstream consumers (especially coroutines) despite being source-compatible for Java via deprecation only.

Overview
Aligns the JSON.GET API with Redis behavior by adding single-result methods: jsonGetValue(...) returning JsonValue and jsonGetValueRaw(...) returning a raw String, implemented across async/reactive/sync, cluster node selection, and coroutines.

Marks the existing jsonGet(...)/jsonGetRaw(...) list-returning methods as deprecated (since they imply multiple bulk replies), adds a new JsonValueOutput for parsing a single reply, and expands integration tests to cover multi-key/multi-path behavior and the new single-value APIs.

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