Add an option to use "::" for the external crate prefix.

[wada314]

Fixes #11823 . Hi I'm very new to rust-analyzer and not sure how the review process are. Can somebody take a look at this PR? thanks!

[rustbot]

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[rustbot]

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[rustbot]

There are merge commits (commits with multiple parents) in your changes. We have a no merge policy so these commits will need to be removed for this pull request to be merged.

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• fe82d24c8cec4c2b82f179c7512f2c2470389ab5

[rustbot]

There are merge commits (commits with multiple parents) in your changes. We have a no merge policy so these commits will need to be removed for this pull request to be merged.

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• f151de87a05d691315d1e5f6df8e9a08ee0f6620

[rustbot]

There are merge commits (commits with multiple parents) in your changes. We have a no merge policy so these commits will need to be removed for this pull request to be merged.

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• b488610b60b0704fd72b9f036265327ed6497440

[rustbot]

There are merge commits (commits with multiple parents) in your changes. We have a no merge policy so these commits will need to be removed for this pull request to be merged.

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$ # rebase
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The following commits are merge commits (since this message was last posted):

• d1a71f12cad0630817e0d07ee719a66b650f3c25

[Veykril]

Thanks! @bors r+

[bors]

:pushpin: Commit 3725ab3146a8dea5eed631cfa03652e9d6b0a3ba has been approved by Veykril

It is now in the queue for this repository.

[bors]

:hourglass: Testing commit 3725ab3146a8dea5eed631cfa03652e9d6b0a3ba with merge a494aaba87f6dfd025dcba44ce84356d026581e3...

[bors]

:sunny: Test successful - checks-actions Approved by: Veykril Pushing a494aaba87f6dfd025dcba44ce84356d026581e3 to master...