Svix

* Libs: Add operational webhook endpoint API
* Libs/Rust: **[Breaking]** Models for PATCH endpoints now have `Option<Option<T>>` fields to allow explicitly sending nulls to unset those fields.
* Libs/Go: **[Breaking]** Nullable arrays are once again represented by `[]T` instead of `*[]T`. Serialization handles the empty case correctly.
* Libs: Upgrade `openapi-generator` to 7.9.0, with dependency upgrades and internal changes in the SDKs.
* Server: Add Redis sentinel support
* Server: Add OTEL metrics for Redis queues
* Server: Add Redis DLQ support
* Server: Several dependency upgrades and CI improvements

* Server: Increase max endpoint rotations
* Server: Return 409 on duplicate message insert
* Server: Add `expunge` parameter to event-type deletion endpoint
* Server: Add `message.attempt.recovered` operational webhook

* Libs(Go): `EndpointUpdate` and `EndpointPatch` allow null for channels, filter types

* Libs(Go): edit `EndpointIn` to allow null for channels, filter types

* Libs/Python: Revert breaking change to MessageInPayload/MessageOutPayload

* Libs/Rust: Add missing export of `V1MessageEventsParams`