JSON Data format for Flux Queries

Nobody has claimed this yet.

__Proposal:__
Add JSON output support for Flux queries.

__Current behavior:__
Currently, when executing queries using the HTTP API with the Flux language, the resulting data is returned ONLY in CSV format. Link: [InfluxDB API](https://docs.influxdata.com/flux/v0.50/guides/executing-queries/#influxdb-api)

__Desired behavior:__
It would be incredibly useful if the HTTP API (or all other subsequent APIs) had an option to return data in JSON format, rather than CSV.

__Alternatives considered:__
The alternative to this is to use a CSV to JSON transformer, but on large datasets, this can be an expensive operation and time consuming.

__Use case:__
It's 2020. Given the vast amount of APIs that primarily use JSON as their data-interchange format, you would think a modern database like InfluxDB could return data in a more structured and portable format other than CSV. Almost all of our services use JSON as the data exchange format, and we would really like to leverage the power of Flux and InfluxDB. Unfortunately, due to this limitation, we are unable to use Flux and InfluxDB.

The issue points to the Flux HTTP API documentation for the current CSV response behavior. Review that API path and determine how JSON output should be exposed across the relevant APIs. Done means Flux query results can be requested and returned in JSON without requiring a CSV-to-JSON conversion.

Written by the indexing model from the issue text.