Add missing operators to the tree-sitter grammar

[Ben3eeE]

Requirements

• Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
• All new code requires tests to ensure against regressions

Description of the Change

Sync up operators with the textmate grammar. It's possible I missed some 😅 I didn't add ** or **= because they are not parsed by tree-sitter. They are also experimental according to MDN.

Textmate (one-dark-ui)

Tree-sitter (Before this PR)

Tree-sitter (With this PR)

Alternate Designs

N/A

Benefits

All operators are styled the same

Possible Drawbacks

• Some people like the inconsistent highlighting of operators that tree-sitter introduced
• It looks like ** and **= is styled correctly because styling is captured by each of the parts. But tree-sitter parses it with ERROR

Applicable Issues

N/A

[maxbrunsfeld]

Looks great! 🚢

Also, would you be up for adding these to the Flow and TypeScript grammar files in language-typescript. I know it's a bit duplicative... maybe we could add some mechanism for sharing these scope mappings at some point.