gopls/internal/golang: suggest smart variable names during extract refactoring

[rizl123]

Improve the variable and constant naming logic in 'extract variable' code
actions. Instead of defaulting to generic names like 'newVar', gopls now
derives candidate variable names based on:

• Stripping action prefixes from call expressions

  config := parseConfig()

• Selector/field names for field expressions
• Type names, unwrapped pointers, and pluralized slice/array containers
• Special well-known types (e.g. error -> err)
• Converting acronyms/initialisms to lowerCamelCase

  url := GetURL()

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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]

Message from Ris:

Patch Set 2:

(1 comment)

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[gopherbot]

This PR (HEAD: 85ada56) has been imported to Gerrit for code review.

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