x/tools/gopls: implement struct field generation quickfix

[dennypenta]

Updates: golang/go#70217

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Patch Set 1:

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[gopherbot]

This PR (HEAD: 154aa6a) has been imported to Gerrit for code review.

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[gopherbot]

This PR (HEAD: 93b3bff) has been imported to Gerrit for code review.

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• See the Sending a change via GitHub and Reviews sections of the Contribution Guide as well as the FAQ for details.