[VSCode extension] In suggestions, prefer types where uppercase letters match

### Description

When I type `FL`, NetBeans autocompletes something as below. However, I'd like types where the uppercase letters match, such as `FlavorListener`, `FlowLayout`, `FocusListener`, ... to be listed at the start.


### Use case/motivation

Many types are well-known by their uppercase-abbreviated form. For example common exceptions such as UOE, ISE, IAE, NPE, IOOBE, ... or `java.io` types such as `FIS`, `BOS`, ...
Not having these listed first in the suggestions is cumbersome.

### Related issues

_No response_

### Are you willing to submit a pull request?

Yes

### Code of Conduct

Yes

Start by locating the VSCode extension's code that ranks or filters type-completion suggestions; the issue names no files or tests. Reproduce the `FL` completion case and verify that types whose uppercase letters match the typed abbreviation, including `FlavorListener` and `FlowLayout`, appear before other results.

Written by the indexing model from the issue text.