refactor(api): rework of async tasks

[meskill]

Rework of AsyncTasks used for running tasks for replication, resharding etc.:

• define new architecture for AsyncTasks in src/api to define generic way to manage such tasks
• specify new tasks in api that now the single source of truth for cli and admin commands, migrate cli and admin commands to api tasks
• allow tasks to run in hierarchy which makes the relation explicit and manageable from the tasks storage
• introduce lifecycle and inner states for tasks to easier track its progress through logs and SHOW TASKS
• the generic way to gracefully cancel the tasks and subtasks through shared CancellationToken
• handle errors and panics for running tasks and track this status with the error
• add tracing to track the task related logs and their relations
• update the output of SHOW_TASKS to show more info and to show historic info about finished/failed tasks.
• fix some issues with the cancellation of some tasks when they were using tokio::spawn and these tasks were continue to run after stop
• fix the issue with stopping multiple replications running when notify.notify_one() was used and only one stream was actually stopped instead of all of them
• fix the config cutover when the database_name was not provided (caused the wrong connection)
• add integration tests for admin commands

[codecov]

Codecov Report

❌ Patch coverage is 75.85200% with 248 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pgdog/src/api/resharding.rs	0.00%	60 Missing ⚠️
pgdog/src/cli.rs	0.00%	46 Missing ⚠️
...og/src/backend/replication/logical/orchestrator.rs	5.88%	32 Missing ⚠️
pgdog/src/api/replication.rs	72.80%	31 Missing ⚠️
pgdog/src/api/schema_sync.rs	45.09%	28 Missing ⚠️
...nd/replication/logical/publisher/publisher_impl.rs	10.52%	17 Missing ⚠️
pgdog/src/api/async_task.rs	97.89%	13 Missing ⚠️
pgdog/src/api/copy_data.rs	0.00%	8 Missing ⚠️
pgdog/src/backend/schema/sync/pg_dump.rs	0.00%	5 Missing ⚠️
pgdog/src/admin/schema_sync.rs	0.00%	3 Missing ⚠️
... and 3 more

📢 Thoughts on this report? Let us know!

[levkk]

[sgrif]

☠️