tools/gopls: add command line support for links

[kalmanb]

This adds support for calling links from the gopls command line,
e.g.

$ gopls links ~/tmp/foo/main.go

Optional arguments are:
-json, which emits range and uri in JSON
With no arguments, a unique list of links are emitted.

Updates golang/go#32875

[gopherbot]

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Please visit https://go-review.googlesource.com/c/tools/+/203297 to see it.

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[gopherbot]

Message from Rebecca Stambler:

Patch Set 1:

(5 comments)

Thank you for contributing this change! A few small comments.

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[gopherbot]

This PR (HEAD: 736b606) has been imported to Gerrit for code review.

Please visit https://go-review.googlesource.com/c/tools/+/203297 to see it.

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See the Wiki page for more info

[gopherbot]

Message from Kalman Bekesi:

Patch Set 3:

(6 comments)

Updated, thanks.

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[gopherbot]

Message from Rebecca Stambler:

Patch Set 3:

(1 comment)

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[gopherbot]

This PR (HEAD: 48eb095) has been imported to Gerrit for code review.

Please visit https://go-review.googlesource.com/c/tools/+/203297 to see it.

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[gopherbot]

Message from Kalman Bekesi:

Patch Set 4:

(1 comment)

Patch Set 3:

(1 comment)

I've refactored the tests and rebased.

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Message from Rebecca Stambler:

Patch Set 4:

(2 comments)

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[gopherbot]

This PR (HEAD: 7ed1e46) has been imported to Gerrit for code review.

Please visit https://go-review.googlesource.com/c/tools/+/203297 to see it.

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[gopherbot]

Message from Kalman Bekesi:

Patch Set 5:

(2 comments)

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[gopherbot]

Message from Rebecca Stambler:

Patch Set 6: Run-TryBot+1 Code-Review+2

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[gopherbot]

Message from Gobot Gobot:

Patch Set 6:

TryBots beginning. Status page: https://farmer.golang.org/try?commit=8732f011

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Message from Gobot Gobot:

Patch Set 6: TryBot-Result+1

TryBots are happy.

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[gopherbot]

This PR is being closed because golang.org/cl/203297 has been merged.