Laurens Valk fe120484b6 py/gc: Add hook to run code during time consuming GC operations. ...

This makes it possible for cooperative multitasking systems to keep running
event loops during garbage collector operations.

For example, this can be used to ensure that a motor control loop runs
approximately each 5 ms.  Without this hook, the loop time can jump to
about 15 ms.

Addresses #3475.

Signed-off-by: Laurens Valk <laurens@pybricks.com>

2021-11-01 15:39:37 +11:00

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