agent: Fuzzy search in model selector (#30281)

This change enables fuzzy search on model providers and names. For
example, the query "z41" will match "zed/gpt-4.1".

Release Notes:

- Agent: Improved model selection with fuzzy search support

Cargo.lock

@@ -7813,9 +7813,12 @@ version = "0.1.0"
 dependencies = [
  "collections",
  "feature_flags",
+ "futures 0.3.31",
+ "fuzzy",
  "gpui",
  "language_model",
  "log",
+ "ordered-float 2.10.1",
  "picker",
  "proto",
  "ui",