explore use of github.com/golang/tools/internal/imports for performance

[komuw]

ModuleResolver implements resolver for modules using the go command as little - https://github.com/golang/tools/blob/fe37c9e135b934191089b245ac29325091462508/internal/imports/mod.go#L26-L28

So maybe it might be a bit performant than what ote is currently doing; https://github.com/golang/tools/blob/fe37c9e135b934191089b245ac29325091462508/internal/imports/mod.go#L218-L221