refactor: replace actor tags with key-based identification

[NathanFlurry]

No description provided.

[NathanFlurry]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• fix(core): fix reporting errors for sse initiation #955
• fix(core): fix sse support #954
• test: test both websockets & sse in drivers #953
• chore: remove transport negotiation #952
• feat: add actor proxy support for HTTP fallback #951
• feat: add maximum key size limit to ActorKeySchema #950
• refactor: replace actor tags with key-based identification #949 👈 (View in Graphite)
• refactor: rename ActorHandle to ActorConn for clarity #948
• refactor: update actor API to separate tags parameter #947
• main

---

How to use the Graphite Merge Queue

Add either label to this PR to merge it via the merge queue:

• merge queue - adds this PR to the back of the merge queue
• hotfix - for urgent hot fixes, skip the queue and merge this PR next

You must have a Graphite account in order to use the merge queue. Sign up using this link.

An organization admin has enabled the Graphite Merge Queue in this repository.

Please do not merge from GitHub as this will restart CI on PRs being processed by the merge queue.

This stack of pull requests is managed by Graphite. Learn more about stacking.