Adds metric tags to storage instrumentation

[cdemi]

This PR aims to add support for tagging telemetry with contextual metadata (Storage Provider Name, State Name and State Type).

The current telemetry for storage operations (read/write/delete/errors) provides aggregate insights but lacks the granularity needed to troubleshoot issues or analyze behavior per provider or state.

This will enable, for example, Prometheus queries like:

sum by (provider_name, state_name) (orleans_storage_write_errors)

I think it will be very useful for identifying noisy or error-prone storage providers, differentiating latency by grain state type or maybe alerting on specific grain state issues.

The StateStorageBridge<TState> constructs the tag array once per instance and reuses it for all metric operations. Since I made changes here I also changed the storage provider type name .GetType().Name to be computed once during construction instead of on every operation, reducing redundant string allocations

Microsoft Reviewers: Open in CodeFlow

[cdemi]

@ReubenBond, could I trouble you to have a look at this PR?

[ReubenBond]

Thanks for the ping, @cdemi - I left a comment. I believe we should address that before merge

[cdemi]

Thanks for the feedback, @ReubenBond! I have made changes according to your feedback. I can't pass StateStorageBridgeShared<TState> to StorageInstruments since Orleans.Runtime depends on Orleans.Core so I added them as parameters instead

[ReubenBond]

Thanks, @cdemi! I added one last comment, otherwise LGTM

[cdemi]

You're absolutely right. Should be OK now