[Proposal] Extend multibindings overload for Bind and MultiFuncConverter from 4 bindings to at least 6 bindings

[stephenquan]

The .Bind() method extension is very convenient short hand for MultiBindings. However, often, I want a few more than the 1-4 that's offered. If it's up to 6 or, even better, 9, it will cover a lot of my use cases. For example, the following does not compile, it errors with CS1739 The best overload for 'Bind' does not have a parameter named 'binding1'. If I were to refactor our binding5 the example starts working:

public enum TokenType { Null, Number, String, Boolean, Operator, Function, Node, RelativeNode, PullData, PullDataProperty, PullDataExif, PullDataJavascript, Symbol };
public partial class TokenView : ContentView
{
    [BindableProperty] public partial TokenType TokenType { get; set; } = TokenType.Null;
    [BindableProperty] public partial Color ConstantColor { get; set; } = Colors.Red;
    [BindableProperty] public partial Color FunctionColor { get; set; } = Colors.Green;
    [BindableProperty] public partial Color NodeColor { get; set; } = Colors.Blue;
    [BindableProperty] public partial Color SymbolColor { get; set; } = Colors.Gray;
    [BindableProperty] public partial Color TextColor { get; set; } = Colors.Black;
    public TokenView()
    {
        this.Bind(
            TextColorProperty,
            binding1: BindingBase.Create(static (TokenView v) => v.TokenType, BindingMode.OneWay, source: this),
            binding2: BindingBase.Create(static (TokenView v) => v.ConstantColor, BindingMode.OneWay, source: this),
            binding3: BindingBase.Create(static (TokenView v) => v.FunctionColor, BindingMode.OneWay, source: this),
            binding4: BindingBase.Create(static (TokenView v) => v.NodeColor, BindingMode.OneWay, source: this),
            binding5: BindingBase.Create(static (TokenView v) => v.SymbolColor, BindingMode.OneWay, source: this),
            convert: ((TokenType t, Color? constant, Color? function, Color? node, Color? symbol) v) => v.t switch
            {
                TokenType.Null => v.constant,
                TokenType.Number => v.constant,
                TokenType.String => v.constant,
                TokenType.Boolean => v.constant,
                TokenType.Operator => v.function,
                TokenType.Function => v.function,
                TokenType.PullData => v.function,
                TokenType.PullDataProperty => v.function,
                TokenType.PullDataExif => v.function,
                TokenType.PullDataJavascript => v.function,
                TokenType.Node => v.node,
                TokenType.RelativeNode => v.node,
                _ => v.symbol
            },
            mode: BindingMode.OneWay);
    }
}