IS there any plan to send JSON with http proto?

[sammerry]

Is your feature request related to a problem?
No

Describe the solution you'd like
I'd like to send json formatted http otlp events. It currently defaults to the form encoded request outlined in the requests docs. Can we set the request format via environment variables?

Additional context
The default requests post sends form encoded data. In order to support json the python http client would need the following change.

self.session.post("http://somewhere.org/endpoint", data=json.dumps(data))

https://github.com/open-telemetry/opentelemetry-python/blob/main/exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/trace_exporter/__init__.py#L102

[codeboten]

@sammerry there's another issue opened for this work: #1003. We just haven't had time to get around to implementing it yet, would love a PR if you have time for it though!