Add double-click and drag and triple-click and drag to select multiple words and to select multiple paragraphs

[Poopooracoocoo]

Is your feature request related to a problem? Please describe.

It can be difficult to select large chunks of text at a time

Describe the solution you'd like

Double-click and drag and triple-click and drag are UX paradigms found on other platforms.

Describe alternatives you've considered

N/A

Additional context

Tested on TextEdit demo

[emilk]

Sounds nice - you should be able to add it to crates/egui/src/widgets/text_edit/builder.rs