feat: scheduling extensions #1131
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Description
Adds support for scheduling extensions, which are needed to implement autoscalers. Currently, the only information passed to the extension is the list of workers, their labels, and the actions and slots on the scheduler. This allows for computing the percentage of slots on workers which are utilized.
Note that this data is sent pre-flush, so there are rare cases where there will be an inconsistency between the extension and the data flushed to the database. Considering these cases should be rare and autoscaling is done on a rolling average anyway, this currently seems acceptable.
Type of change