Draft: Remove isc_task completely

Closed Evan Hunt requested to merge each-task-async-refactoring into main

This is a single large branch that removes uses of isc_task throughout BIND and then finally removes all the task-related modules entirely (isc_task, isc_taskmgr, isc_event, etc).

This might end up being broken up into smaller MR's to be reviewed and merged separately, but I'm testing all the changes together here.

Edited by Evan Hunt

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