[clangd-dev] Code completion overload folding

[Sam McCall via clangd-dev]

What do we think about bundling overloaded functions into one completion
item, vs clangd's current behavior of providing each overload of a function
as a separate completion item?

Off the top of my head, bundling pros:
 - less noise
 - present more diverse results
Bundling cons:
 - lose the signature
 - complicated interactions with e.g. include insertion

My own feeling is that bundling is a win on balance if the editor has good
signature help support. This might be personal enough to make an option.

I built a hacky prototype if you want to play with this behavior: patch in
https://reviews.llvm.org/D47957.
Screenshot: https://i.imgur.com/vh25i20.png

The behavior is to bundle together c++ method calls by name, and function
calls by qualified name (namespaces must match). I don't know much about
ObjC, I'm not sure if grouping on the first chunk of the selector would
make sense.

Cool things you could do:
 - pull individual elements out of the bundle if they're high ranking enough
 - explode the bundle once the query is unambiguous (client-side filtering
is a problem here)
 - attempt to summarize similar signatures (e.g. show return type if it's
the same for all overloads, show similar parts of const/non-const member
overloads)
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