[controls] improve performance of {Binding}

[jonathanpeppers]

I wrote a benchmark for Binding, such as:

[Benchmark]
public void BindName()
{
    var binding = new Binding("Name", source: Source);
    Target.SetBinding(MyObject.NameProperty, binding);
}

Attaching dotnet-trace, I found ~53% of the time was spent in MethodInfo.GetParameters():

core.benchmarks!Microsoft.Maui.Benchmarks.BindingBenchmarker.BindName()
...
microsoft.maui.controls!Microsoft.Maui.Controls.BindingExpression.SetupPart()
System.Private.CoreLib.il!System.Reflection.RuntimeMethodInfo.GetParameters()

Reviewing the code, it was basically calling:

System.Reflection.PropertyInfo.SetMethod.GetParameters()[0].ParameterType;

We can just call PropertyInfo.PropertyType instead, to avoid allocating a ParameterInfo[] and indexing into it.

The results of this change in my benchmarks:

Method	Mean	Error	StdDev	Gen0	Gen1	Allocated
--BindName	18.82 us	0.336 us	0.471 us	1.2817	1.2512	10.55 KB
++BindName	18.80 us	0.371 us	0.555 us	1.2512	1.2207	10.23 KB
--BindChild	27.47 us	0.542 us	0.827 us	2.0142	1.9836	16.56 KB
++BindChild	26.71 us	0.516 us	0.652 us	1.9226	1.8921	15.94 KB
--BindChildIndexer	58.39 us	1.113 us	1.143 us	3.1738	3.1128	26.17 KB
++BindChildIndexer	58.00 us	1.055 us	1.295 us	3.1128	3.0518	25.47 KB

-- Before
++ After

This should help scrolling performance such as in #12130, where bindings are updating while scrolling.