Depending on RocksDBOptions#TIMER_SERVICE_IMPL we have to adapt the testCancelFullyAsyncCheckpoints wrt
how many checkpointing streams we skip.

In order to fully enable the RocksDBOptions#TIMER_SERVICE_IMPL we should use the default value
of this config option instead of "".

Rename from backend.rocksdb.priority_queue_state_type into state.backend.rocksdb.timer-service.impl

Optimization for relaxed bulk polls

Deactivate optimization for now because it still contains a bug

This closes #6333.

This closes #6327.

This closes #6340.

This closes #6289.

This closes #6338

[FLINK-9314] [security] (part 4) Add mutual authentication for internal Netty and Blob Server connections

This closes #6326.

[FLINK-9313] [security] (part 2) Split SSL configuration into internal (rpc, data transport, blob server) and external (REST)

This also uses SSLEngineFactory for all SSLEngine creations.

This removes hostname verification from SSL client sockets.
With client authentication, this is no longer needed and it is not compatible with
various container environments.

This closes #6332.

This closes #6260

This closes #6109

This closes #5516

[FLINK-9404] [file sink] Bucketing sink uses target directory rather than home directory during reflectTruncate

This closes #6050

Usually it is very uncommon to define both a batch and streaming source in the same factory. Separating by environment is a concept that can be find throughout the entire flink-table module because both sources and sinks behave quite different per environment.

This closes #6323.

The declaration of a table type is SQL Client/context specific and should not be part of a descriptor.

- Rename to TableFactory and move it to org.apache.flink.table.factories package
- Unify source/sink/format factories with same logic and exceptions

This closes #6201.

This PR introduces a format discovery mechanism based on Java Service Providers. The general `TableFormatFactory` is similar to the existing table source discovery mechanism. However, it allows for arbirary format interfaces that might be introduced in the future. At the moment, a connector can request configured instances of `DeserializationSchema` and `SerializationSchema`. In the future we can add interfaces such as a `Writer` or `KeyedSerializationSchema` without breaking backwards compatibility.

This PR deprecates the existing strong coupling of connector and format for the Kafa table sources and table source factories. It introduces descriptor-based alternatives.

[FLINK-9701] [state] (follow up) Use StateTtlConfiguration.DISABLED instead of null, make it Serializable and add
convenience methods to its builder

This closes #6331.

Added NoOrFixedIfCheckpointingEnabledRestartStrategy

This closes #6283.

This closes #6185.

Extend the flink-container/docker/build.sh script to also accept a Flink archive to build
the image from. This makes it easier to build an image from one of the convenience releases.