refactor(parser): introduce ast::FunctionArgList to contain all info in () of function call

[stdrc]

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What's changed and what's your intention?

A new FunctionArgList ast struct is introduced to contain all informations inside () of a function call, so that things can be clearer:

pub struct FunctionArgList {
    /// Aggregate function calls may have a `DISTINCT`, e.g. `count(DISTINCT x)`.
    pub distinct: bool,
    pub args: Vec<FunctionArg>,
    /// Whether the last argument is variadic, e.g. `foo(a, b, VARIADIC c)`.
    pub variadic: bool,
    /// Aggregate function calls may have an `ORDER BY`, e.g. `array_agg(x ORDER BY y)`.
    pub order_by: Vec<OrderByExpr>,
}

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
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• My PR contains breaking changes. (If it deprecates some features, please create a tracking issue to remove them in the future).
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Documentation

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Release note

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[stdrc]

• feat(parser): parse IGNORE NULLS in (window) function calls #18028
• refactor(parser): introduce ast::FunctionArgList to contain all info in () of function call #18029 👈
• fix(meta): fix query rename visitor for complex func calls #18023
• main

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