Add versioning API methods to client

[Sushisource]

What was changed

Added top-level methods for the versioning API to the client. Added worker flag to opt in to the feature

Go fmt also seemed to get a little more... aggressive? Some changes b/c of that.

Why?

So we can use them in tctl and eventually release

Checklist

Relates to https://github.com/temporalio/tctl/issues/250

1. Closes

2. How was this tested: Added some tests

3. Any docs updates needed?

[Sushisource]

Draft until API changes merged