auto-completion feature request: rank items that starts with __ lower

[quantum-booty]

Currently, items that start with __ are ranked higher than the rest. In Python, items that start with __ are generally protected variables or dunder methods, which should not be called directly. Therefore they should be ranked lower in auto-completion.

[pascalkuthe]

The intal order of compeltuon items depends on the LSP, not helix so you should suggest this upstream