LS: Suggest function names from common traits

[Arcticae]

Feature Request

Describe the Feature Request

We should implement a file completion suggestion that will also auto-import the trait in the nearest scope, upon selection (within a popup like shown below)

Describe Preferred Solution

Describe Alternatives

Related Code

Additional Context

If the feature request is approved, would you be willing to submit a PR?
(Help can be provided if you need assistance submitting a PR)

• Yes
• No

[mkaput]

I think this might be related, though it refers to a code action, not completion #6647?

[Arcticae]

@mkaput adding the import is also a consideration here - but it seems to be related. I will put the other one as a priority to check since it'll be effectively blocking this.