feat: add kusto grammar

[KevinBatdorf]

This add grammar for Kusto (link)

I added the alias kql but I'm not 100% sure what effect aliases have so just making a note here.

• 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]

It means kql language will use kusto grammar for rendering. Thanks for yoru contribution!