[Feature Request] Advanced metrics support

[cretz]

Describe the solution you'd like

With temporalio/sdk-core#544 landed, we need to:

• Support any missing prom options (done in Update core/tonic, update metric options, remove core tracing #380)
• Support any missing otel options (done in Update core/tonic, update metric options, remove core tracing #380)
• Support user-accessible metric buffer-based forwarding
• Support Python provided metric implementation We're gonna consider this too expensive at this time and not write this
• Support access to metrics from runtime (done in Custom metric support #384)
• Support access to metrics from activity with default activity tags (done in Custom metric support #384)
• Support access to metrics from workflow with default workflow tags and ignore metric updates during replay by default (done in Custom metric support #384)