Add a way to control the blocking behavior with multiple blockers

[joseinaqa]

There should be a way to control the blocking behavior when multiple blockers are present. I suggest that we add an optional priority parameter to the blockers, call and await them in descending order, and pass to the next blocker whether the navigation is blocked by the blockers with higher priority.

I can make a PR if the maintainers approve the idea.

[schiller-manuel]

remind me please, whats the current behavior with multiple blockers?

[joseinaqa]

Currently the blockers are added to an array in a useEffect and run by the inserted order. if a blocker blocks the navigation the next ones are not executed. So the order is determined by the order of the useEffects.

[schiller-manuel]

how would a priority based concept work in detail? would this just rely on a number that needs to be high/low to win? are there better approaches to coordinate this across multiple blockers?