Change grpc options (channel_arguments) from dict to tuple

[felicijus]

Is your feature request related to a problem? Please describe.

When changing between librarys we should not expect users to define the channel options differently than the official grpc package itself.

Describe the solution you'd like

We should rewrite that to just use tuples as grpc itself does.

e.g. Link to the Documentation suggests tuple[tuple[...]] (('grpc.so_reuseport', 0),) but we expect Dict[str, Any].

pyzeebe/pyzeebe/channel/camunda_cloud_channel.py

Line 30 in de788a8

channel_options (Optional[Dict], optional): GRPC channel options. See https://grpc.github.io/grpc/python/glossary.html

Additional context

https://grpc.github.io/grpc/python/glossary.html

I think it (changing options from dict to tuple) should be in another PR.

Originally posted by @dimastbk in #468 (comment)