Rework StackdriverTaskHandler for the structlog era #65191

[haseebmalik18]

Add StackdriverRemoteLogIO with processors for real-time log streaming, upload(), and read() methods following the same pattern as CloudWatch, GCS, S3, HDFS, and other backends migrated in #48491.

Update airflow_local_settings.py to set REMOTE_TASK_LOG instead of patching DEFAULT_LOGGING_CONFIG handlers.

closes: #65191

[eladkal]

If possible this file should be extracted to a separated PR since core and providers don't have the same release cycle

[ashb]

@amoghrajesh This sort of change (needing this in the provider for it to be functional) was exactly the sort of thing I wanted us to look at

[ashb]

Please follow the pattern used for for the other Google logging provider -- make the *TaskHandler have a self.io property of the new Remote IO class and delegate things to it, rather than duplicating all the logic twice.