This closes #7401.

[hotfix] Rename keySerializerConfigSnapshot to keySerializerSnapshot in KeyedBackendSerializationProxy

Remove "config" from the field names and getter name to reflect the new
abstraction TypeSerializerSnapshot.

This commit adapts the StateSerializerProvider to respect the
COMPATIBLE_WITH_RECONFIGURED_SERIALIZER case, which effectively lets all
state backends respect serializer reconfiguration because state
serializers are always obtained via StateSerializerProviders.

It also makes StateSerializerProvider work for both eagerly / lazily
registered serializers.
This is required so that the StateSerializerProvider can be used for the
key serializer in AbstractKeyedStateBackend. For the key serializer,
regardless of whether or not we're restoring old state, we always first
get the new key serializer, and then maybe get the previous key
serializer's snapshot in the restore phase.

Therefore, after this commit, access the key serializer in
AbstractKeyedStateBackend is also governed by a StateSerializerProvider.

For a more fine-grained explaination of all the changes that build up to
this, please refer to #7329.

This closes #7329.

[FLINK-11073] [core] Add COMPATIBLE_WITH_RECONFIGURED_SERIALIZER to TypeSerializerSchemaCompatibility

This closes #7288.
Co-authored-by: NStefan Richter <s.richter@data-artisans.com>
Co-authored-by: Nklion26 <qcx978132955@gmail.com>

This closes #7079.

This closes #7078

This closes #7271.

[FLINK-11173][table] Fix the exception message of proctime attribute validation in TableSourceUtil#validateTableSource

This closes #7374.

This closes #7373.

This closes #7379.

This closes #7388.

- fix the logic in supportsBatch to properly declare a batch-only table
- adjust CommonTestData to provide batch-only or streaming-only tables

This closes #7386.

+es5

+es2

This colses #7316

[FLINK-10781][fs] Update BucketingSinkMigrationTest for Flink 1.7