feat: add cypher grammar

[KevinBatdorf]

This adds the Cypher query language grammar (source)

The grammar mentions "fileTypes": ["cql", "cyp", "cypher"],. Should these be added somewhere as aliases perhaps?

• I have read docs for adding a language.
• I have searched around and this is the most up-to-date, actively maintained version of the language grammar.
• I have added a sample file that includes a variety of language syntaxes and succinctly captures the idiosyncrasy of a language. See docs for requirement.

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[octref]

In grammarSources.ts, you can find languageAliases. I think cql sounds reasonable. From my googling I didn't find any files with cyp suffix.

[KevinBatdorf]

Thanks here too, added that now. Good to check again when you're ready.

[octref]

LGTM 🚀