Eclipse Ditto 2.4.0

Eclipse Ditto 2.4.0 includes the following topics/enhancements:

• W3C WoT (Web of Things) integration
• SSE (ServerSentEvent) API for subscribing to messages
• Recovery status for connections indicating when e.g. recovery is no longer tried after max backoff
• Enhance placeholders to resolve to multiple values
• Advanced JWT placeholder operations
• Support for a wildcard/placeholder identifying the changed feature in order to enrich e.g. its definition

The following notable fixes are included:

• Several fixes and improvements regarding consistency and performance of search updates
• Don't publish messages with failed enrichments and issue failed ack
• Filter for incorrect element types in jsonArray of feature definitions
• Fix of placeholder resolvment in "commandHeaders" of "ImplicitThingCreation" mapper
• Fix fn:substring-after() function returning incorrect data

The following non-functional work is also included:

• Upgrade of compiler target level for service modules from Java 11 to Java 17
• Switch of used Java runtime in pre-built Docker containers from OpenJ9 to Hotspot
• Publication of pre-built multi-architecture Docker images for `linux/amd64` (as always) and now in addition `linux/arm64`
• Removal of rate limiting / throttling limits as default
• Update of several used dependencies