feat: synchronize async tasks write

[jyeshe]

What

• Runs aex9 tasks asynchronously
• Purges aex9 in-memory and persisted records belonging to invalidated blocks
• Synchronizes the writing of async task result with the main sync database transaction so that if the task finishes later it writes directly to the database.
• Avoid rerunning the tasks for on-db sync (use previous in-memory task result to write to database)

Why

Refs #749

Validation steps

• test/ae_mdw/sync/async_tasks/update_aex9_state_test.exs
  • validates writing to async (in-memory) store
• test/ae_mdw/sync/async_tasks/store_test.exs
  • validates not to insert a task when it had been added before (if added to on-memory doesn't do for on-db sync)
• test/ae_mdw/db/state_test.exs
  • validates the synchronization to write to memory or to disk
  • validates that if task was enqueued by on-memory sync it does not run again during on-db sync
  • validates that commit to database uses previously run task results
  • validates that pending tasks are only persisted during commit to database
• test/ae_mdw/db/sync/async_tasks/producer_consumer_test.exs
  • validates enqueuing and dequeuing tasks
• test/ae_mdw/db/sync/async_tasks/producer_test.exs
  • validates that pending tasks are persisted after saving in case of server restart

Notes

Next tasks:

1. Keep the sorting while enqueuing with State
2. Allow enqueuing tasks to rerun if it's in processing state
3. Avoid rerunning the tasks during in-memory sync by detecting invalidations outside of the task
4. After 3, cache next hashes in a way to avoid walking through the blocks repeatedly for every task call.

[jyeshe]

IdxAex9AccountPresence to be removed from database later to allow reusing previous snapshots without faking the table locally.

[sborrazas]

🙏

[sborrazas]

Debug comments