Add scoped, not, and, or keyword highlights

[alihakankurt]

Summary

Adds syntax highlighting for not, or, and, and scoped keywords in the C# tree-sitter highlights.

• not / or / and: highlight pattern keywords via negated_pattern, or_pattern, and_pattern
• scoped: highlight the scoped type keyword via scoped_type

Before / After

Test Plan

Opened a .cs file using a pattern expression and verified not, or, and, and scoped are highlighted.

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[alihakankurt]

@cla-bot check

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[MrSubidubi]

Very nice, thanks and congrats to such a good first contribution! 🎉