InfluxQLQueryApi.queryJson should not transform all values to String

[Willena]

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Proposal: It would be nice if influxQLQueryApi.queryJson() can preserve field types instead of converting everything to Strings. ValueExtractor should expose an API with raw types.

Current behavior: Unless a ValueExtractor is present, every values get transformed to String even of the InfluxDB Json result contains a non string value.

Desired behavior: Unless a value extractor is specified, the JSON result should preserve original response types as much as possible

Alternatives considered: For now, provide a value extractor that parse each String values. It works but doing twice the job: for a number value it get read by Gson as Number then the client converts it to String then manually converted to back to a number.

Use case: All use cases using influxQLQueryApi.