* GH-8642: Revise executors in the project
Fixes https://github.com/spring-projects/spring-integration/issues/8642
* Rework some `Executors.newSingleThreadExecutor()` to `ExecutorServiceAdapter(new SimpleAsyncTaskExecutor())`
* Expose `TaskExecutor` setters; deprecate `ExecutorService`-based
* Some other code clean up in the effected classes: `LogAccessor`, no `synchronized` in critical blocks
* Give a meaningful prefix for default threads in the context of components, e.g. `SubscribableRedisChannel` - `getBeanName() + "-"`
* * Fix `PostgresChannelMessageTableSubscriberTests` for
`PostgresSubscribableChannel` initialization to let it create
its internal `Executor`
* Use an `AsyncTaskExecutor` injection instead of `ExecutorServiceAdapter` wrapping
* Fix `LockRegistryLeaderInitiatorTests` for `taskExecutor` injection
* Bring back `LockRegistryLeaderInitiator.setExecutorService()`
as an accident after property auto-renaming
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