fix: Fix marker function parsing when used after bracket syntax casting expression

[pmpak]

The issue is that the tsquery.ast defaults to parsing the source as TSX, which causes problems when bracket syntax casting (<Type>) is used. This is because the parser confuses the casting syntax with JSX. To resolve this, we need to explicitly set the ScriptKind parameter to TS.

In the ast function description is also suggested to use ScriptKind.TS if the code uses the <Type> syntax for casting.

"If you are using the <Type> syntax for casting, you should use ScriptKind.TS."
https://github.com/phenomnomnominal/tsquery/blob/master/src/ast.ts#L12

This change ensures that the parser passes the correct ScriptKind to the ast function based on the source file extension, so that for .ts files it avoids the confusion with JSX and preventing parsing errors.

Fixes #43