[💡 FEATURE REQUEST]: Temporal: Provide some sugar for users to set the Authorization header

[rustatian]

Plugin

roadrunner-temporal

I have an idea!

From the internal discussion:
re. the API key feature we talked about this morning, basically we need to do something like this for PHP:

• API key support via credentials abstraction temporalio/sdk-go#1409
• Override API key with user metadata temporalio/sdk-go#1419

Idea is just to provide some sugar for users to set the Authorization header in gRPC connections so they can use API keys to talk to the server (instead of mTLS), and to make it dynamic so keys can be rotated without having to restart clients/workers.