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

We need to add annotations to workflows to support the new versioning APIs. Refer to temporalio/features#548 for the Go equivalents.

Describe the solution you'd like

There are some designs for our other languages here: https://docs.google.com/document/d/1QGacjnlFwrfFtAvv9besx6sEdr36kJ3zQ9J7bGLRwk4/edit?usp=sharing

In PHP, I fully expect that we should use annotations like in the Python and .NET examples in that doc. Definitely ping me if there are any questions.

Additional context