gopls: implement code action to split and group args/elements/return values into single/separate lines

[fatanugraha]

Implement a code action to easily refactor function arguments, return
values, and composite literal elements into separate lines or a single
line.

This feature would be particularly helpful when working on large
business-related features that often require long variable names.
The ability to quickly split or group lines would significantly
accelerate refactoring efforts to ensure code adheres to specified
character limits.

Fixes golang/go#65156

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Patch Set 1:

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