Block or moderate creating pull requests

[karussell]

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We have a medium sized open source project and only over the last 2 weeks there were 3 accidental pull requests where the owners probably accidentally targeted our repository instead of their own or whatever.

Can we please get an approval feature for outside collaborators before they can create pull requests? (and steal attention or spam)

Having this for issues is debatable due to the open source nature, but for pull requests this could be easily fixed.