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✨ stream/download data from server in arrow/parquet/json #1825

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This allows a user to download a filtered dataframe using the
REST api, which can also be used standalone.

A Python example is in the code/tests/docstring

Example using curl:
$ curl "https://dataframe-dev.vaex.io/download/iris?limit=1&offset=0&output=json" -D -
HTTP/1.1 200 OK
Server: nginx/1.18.0 (Ubuntu)
Date: Thu, 13 Jan 2022 12:43:57 GMT
Content-Type: application/json
Transfer-Encoding: chunked
Connection: keep-alive
accept-ranges: bytes
etag: 4b547427fd670df8c992f840de7edaef
x-process-time: 0.0019412040710449219
x-data-passes: 0

[{"sepal_length":5.9,"sepal_width":3.0,"petal_length":4.2,"petal_width":1.5,"class_":1}]
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