scheduling optimization

[peter198]

Add the --parallel-p1-limit parameter when the worker starts to set the maximum number of PreCommit1 tasks it can accept. When the miner schedules the PreCommit1 task to the worker, it will record the
The number assigned to it, when the number of assigned tasks is equal to the set maximum number of tasks, no new PreCommit1 tasks will be assigned to it, and will not be assigned again until a PreCommit1 task is executed.

The default value of the --parallel-p1-limit parameter is -1, which means no limit, and if the value of --parallel-p1-limit exceeds the maximum number of tasks that the worker hardware configuration can receive
won't work either.
When viewing worker information through lotus-miner sealing workers, the task number information of PreCommit1 will be displayed, as follows:
p1_limit: 15-7, 15 represents the value set by --parallel-p1-limit, 7 represents the number of PreCommit1 tasks currently running.

[magik6k]

Thanks for the PR! This got merged with #8725 (made some changes there; check the description), and now lives in master.