Enable gzip compression of default exporters in initialization API

[bidetofevil]

OpenTelemetryRumInitializer should allow users to enable gzip compressor in the default exporters that it configures.

Specifically, OpenTelemetryRumInitializer.initialize() should take a parameter that allows for that to happen, which ideally defaults to true, but I can understand it initially being false.

Basically something like this: https://github.com/bidetofevil/opentelemetry-android/pull/8/files

But like properly tested.

[breedx-splk]

I just fired up the demo app on main and put wireshark sniffing on the data coming into jaeger on 4318. Gzip was not used (the Accept-encoding: gzip is to tell the server it may reply in gzip):

So yeah, I think that at least confirms that we're not using gzip it by default.

[williazz]

Are we doing major version bump for this?

[breedx-splk]

Are we doing major version bump for this?

I would not expect to, no. If this lands after 1.0.0 is released, it would still be an api-compatible change to add something to the DSL to disable this. Is that a concern?

[breedx-splk]

Also wanted to point out that the spec is clear that servers (ingest endpoints) need to support gzip https://opentelemetry.io/docs/specs/otlp/#protocol-details . With that, enabling gzip by default for Android seems like a sensical choice.