feat: support re-sending events to event observers across restarts

[obycode]

Description

Record events to be sent to event observers in a new sqlite database so that in the event that the node is killed before successfully sending, they can be re-sent on restart.

This is building on top of #5286.

Checklist

• Test coverage for new or modified code paths
• Changelog is updated
• Required documentation changes (e.g., docs/rpc/openapi.yaml and rpc-endpoints.md for v2 endpoints, event-dispatcher.md for new events)
• New clarity functions have corresponding PR in clarity-benchmarking repo
• New integration test(s) added to bitcoin-tests.yml

[obycode]

I'll review these failing integration tests today.

[kantai]

I'll review these failing integration tests today.

I think a few are related to #5283

[obycode]

tests::signer::v0::partial_tenure_fork and tests::nakamoto_integrations::continue_tenure_extend both pass locally.

[obycode]

All integration tests passed now after merging the latest develop and retrying failed tests once!

[ASuciuX]

For mutants there are 2 missed tests and 1 unviable here.

[hstove]

Overall pretty much LGTM, but I'd like to see some tests and more explicit ordering of pending payloads we send

[jferrant]

I am pretty sure I know the answer to my own questions. So will approve :)

[blockstack-devops]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.