Update GDScript syntax highlighting for Godot 4.0

[Calinou]

master version of #5606.

• Highlight annotations.
  • When using the dark theme, the same color as the script editor is used.
• Add binary literals.
• Hexadecimal literals only support lowercase x, so update the syntax to reflect this.
• Update list of keywords for Godot 4.0.
• Update list of built-in functions for Godot 4.0.
• Update list of built-in types for Godot 4.0.

I tested on the GDScript reference page and they work as expected.

This closes #4562.

[mhilbrunner]

Thank you!