passing preferred filter for getting symbol completions

[vzmerr]

Currently for the following sample code, which requires a fuzzy completion:

object Main {
   type MyType = List[Int]
   def list : MT@@
}

dotty completions does not return a result.

It seems to be due to a filter .startsWith(prefix) somewhere.

If would be cool, if the API allows for the passing of a preferred filter instead, so that results like MyType which do not pass the existing filter, can also be retrieved when desired.

This has application in Scala 3 type completions in Metals.

[tgodzik]

I think it would actually be good to move it to the main repo since it's blocking us a bit in terms of UX.