Case Sensitivity of `in` and `!in` keywords do not match documentation

[tomas-pajurek]

According to Kusto documentation, keywords in and !in are case-sensitive by default and there are case-insensitive variants with ~. However, this parser library assigns SyntaxKind values the other way around, as can be seen here:

Kusto-Query-Language/src/Kusto.Language/Syntax/SyntaxFacts.cs

Line 157 in a121c72

new SyntaxData(SyntaxKind.InCsKeyword, "in~", opKind: OperatorKind.InCs),