Svix

* Server: add OpenTelemetry support
* Server: send operational ("incoming") webhooks about events happening on the server.
* Server: enable TLS support for Redis
* Server: use correct timestamp for attempt's id and created.
* Server: add jitter to message retry times.
* Server: fix endpoint spelling in some error messages and comments.
* Server: add built in support for waiting for dependencies (database, redis) to be ready (instead of using a script).

* Server: normalize health status output to be in lowercase.
* Server: implement application portal endpoint and limited access tokens for it.
* Server: add endpoint stats endpoint for getting endpoint statistics.
* Server: add support for JSON log format for use in cloud environments.
* Server: add configuration options for the max pool size for DB and Redis connection pools.
* Server: add CORS headers and support pre-flight requests for use from the browser.
* Server: add a configuration option to only allow https endpoint URLs.
* Server: support passing an org_id when generating JWTs (`svix-server jwt generate`).
* Lib/Python: update httpx dependency to the latest version.
* Lib/Rust: fix mixup with validation errors marked as HTTP errors and vice-versa.

* Libs/Csharp: expose missing getters which prevented a lot of the lib's functionality to be used.

* Server: make the `health` endpoint more useful by adding more status checks to it.
* Server: parse `retry_schedule` as an array rather than string.
* People should use the next syntax: `[1, 2]`, though the old syntax is still supported for backwards compatibility.
* Server: add validation to ensure endpoint URL scheme is either http or https.
* Libs/Python: show a more useful error for obviously malformed secrets.
* Libs/JavaScript: show a more useful error for obviously malformed secrets.

* Libs and server: update OpenAPI spec

* Server: Fix logging configuration in production builds to actually be respected.
* Server: improve how we run Redis migrations.