More client features

[cretz]

What was changed

• Fill out most parameters of start/execute workflow
• Build search attribute collection
• Switched durations from being millisecond ints to second floats
• Expose RPC metadata and timeout to high-level calls
• More explicit generated code for gRPC both Ruby and Rust side
• Support for proper gRPC status details in RPC errors
• Workflow already started error
• Cloud ops protos
• Added RBS signature files
• Added CI check for protos
• Added a couple of tests (many more to come)
• Docs fixes/improvements

[dandavison]

I'm approving this. Obviously it's a lot of code, mostly scaffolding, and hard to review in a thorough sense. I've looked through, and learned a few things, and it all looks great and carefully done. I don't think there's a need at this early stage of the project to block merging this on careful review by others.

[dandavison]

Suggested change

	[[ -z $(git status --porcelain lib/temporalio/api) ]] || (git diff lib/temporalio/api; echo "Protos changed"; exit 1)
	[[ -z $(git status --porcelain lib/temporalio/api) ]] || (git diff lib/temporalio/api; echo "Protos changed" 1>&2; exit 1)

[cretz]

This was taken from https://github.com/temporalio/sdk-python/blob/4aef4bfda19e56c7e7abac36b69e98f60861468c/.github/workflows/ci.yml#L95 so I wonder if we want to fix there too?

[dandavison]

Yep sounds good. Not urgent of course; could do it now or just do it next time one of us touches the CI yaml.