Default encoding of Enpoint.outStream[X] should be JSON array, or the Content Type should be application/json-seq

[gregor-rayman]

Is your feature request related to a problem? Please describe.
Conceptually when an endpoint returns a list of X, it is the same as when it returns a ZStream[_, _, X]. Currently the default output encoding for .out[X] is an JSON array. For .outStream[X] it is however a not separated collection of JSONs. The Content-Type in the response is application/json, correct one would be application/json-seq.

Describe the solution you'd like
Either the data should be returned as a JSON array, so prefixed with [, separated by , and terminated by ], or the Content-Type should be application/json-seq. I'd prefer the array, because that makes the change change from .out[List[X]] to .outStream[X] an internal change of the server, without the need to change the clients.

Describe alternatives you've considered
A viable solution currently (RC10) is to provide custom codes for endpoints with .outStream[X] stream outputs.

[jdegoes]

/bounty $125 to make .outStream[X] return a JSON array, and a test case to prove it.

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Attempt	Started (GMT+0)	Solution
🟢 @gregor-rayman	Sep 10, 2024, 11:46:36 AM	#3122

[gregor-rayman]

/attempt #3113

Implement an encoder with the data interspersed with [, ,, ]

For the decoder parse the array incrementally, not as a single JSON array

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