chore: add more tags to event stream metrics

[aditiharini]

In order to better understand how the stale event processing and the event-specific codepaths impact the message read latency, add tags to identify these attributes.

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PR-Codex overview

This PR adds event kind and stale/not stale tags to event processing metrics in the HubEventStreamConsumer class.

Detailed summary

• Added whenReceived tag to event processing metrics
• Updated metrics for different stages of event processing
• Introduced distinction between current and stale events

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[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: f24049b2c3ca9558be1fe6726c6d46d7197cb19b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ------------------ | ----- | | @farcaster/shuttle | Patch |

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Name	Status	Preview	Comments	Updated (UTC)
hub-monorepo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 11, 2024 3:44pm

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 44.31%. Comparing base (1880070) to head (f24049b). Report is 344 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/shuttle/src/shuttle/eventStream.ts	0.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2307 +/- ## =========================================== - Coverage 74.05% 44.31% -29.75% =========================================== Files 99 146 +47 Lines 9425 25498 +16073 Branches 2097 9094 +6997 =========================================== + Hits 6980 11299 +4319 - Misses 2327 12440 +10113 - Partials 118 1759 +1641 ```

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