gopls/internal/golang/completion: report types in unimported completion

[efrem0ff]

pkgIDmatches handled only the Function, Variable, Struct and Constant symbol
kinds, so an interface or a named non-struct type from a workspace package
was dropped, and a struct type was reported as "var". Report every type as
"type (from ...)", as the other two search paths already do.

All three paths gave a type VariableCompletion, so editors drew a variable
icon beside an item whose detail read "type". Use InterfaceCompletion for an
interface and ClassCompletion otherwise. The standard library and module
cache indexes do not record whether a type is an interface, so those two
paths always use ClassCompletion.

Fixes golang/go#81369

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Patch Set 1:

(1 comment)

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Message from Sergei Efremov:

Patch Set 1:

(2 comments)

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