Svix

* Lib/Rust: add a Rust API client + webhook verification library!
* Lib/Python: fix package installation on Windows.
* Lib/Csharp: make some parameters optional for better ergonomics.
* Server: remove `updated_at` field from static entities.
* Server: change to a more efficient first message dispatch.
* Server: change the redis queue to use redis streams.
* Server: serve nice API docs under `/docs`.
* Server: start version tagging the Docker images. (`latest`, `x`, and `x.y`).
* Server: allow PATCH to delete header values by passing null.
* Server: make it possible to change the hard pagination limits to be soft.
* Server: make the redis queue implementation automatically recover from redis crashes.
* Server: add a `--run-migrations` flag to automatically run migrations (flag still passed in Docker).
* Server: fix worker to not follow HTTP redirects when calling webhooks.

* Server: add support for get-or-create when creating applications.
* C: fix library compilation (broke in the previous release.

* Libs: fix all libraries to handle 429 (rate limiting).
* Server: update docker image to use Rust 1.60
* Server: preserve header name capitalization for custom endpoint headers.
* Server: gracefully handle non-textual webhook responses (so endpoints returning non strings).
* Server: delete message content after the specified retention period.

* Server: add support for idempotency.
* Server: add prev_iterator support to endpoints that should support it.
* Server: make parameter validation stricter in various places.
* Server: improve error messages for bad configurations.
* Server: support for Redis clusters.
* Server: add a memory cache backend.
* Server: fix health endpoint to return an empty response to match its status code (204).
* Server: fix issue that can cause messages to be sent more than once when clients timeout.
* Server: fix support for endpoint id in the list attempted messages and list attempted destinations APIs.
* C: add C API client library.

* Libs/Python: fix user agent to actually work.
* Libs/Python: increase read timeout.
* Server: extend prev_iterator implementation to allow for before and after.
* Server: update Axum dep to latest version.
* Server: add more tests to the suite.

* Server: fix marking of some HTTP errors as failed.
* Server: change base docker image to debian-slim
* Server: update deps.
* Server: added missing list attempts endpoints and missing query parameters to some endpoints.
* Server: switch to KsuidMs for extra precision.
* Server: add missing validation for `IdOrUid` so that they return 422.