Enable Native AOT compatibility (trimming support)

[atifaziz]

This PR enables Native AOT compatibility by supporting trimming. The ToDataTable method (and its overloads) is the only one that needed adjusting because it uses reflection internally to list fields and properties of a type when none are given via quoted lambda expressions. When quoted lambda expressions are supplied, reflection is used for actual invocation when the runtime does not support dynamic code generation.

Unit tests have also been added to exercise the compiled and trimmed native AOT code.

The PR also introduces a breaking change (to improve Native AOT compatibility) where the columns pertaining to public fields will appear before those pertaining to public properties in a DataTable. This only applies when no explicit selection of fields or properties (via expressions) or table schema is provided. The breaking change is considered minor since it would be very rare to have types designed with a mix of public instance fields and properties. Usually, it's more common to have one or the other. Moreover, it's even less common to depend on the order of columns to match the type members. Usually, DataTable columns are indexed by the column name. One could argue that it's not technically a breaking change since the automatic column order is an implementation detail and was never documented to be guaranteed, but there existed a test for the behaviour:

MoreLINQ/MoreLinq.Test/ToDataTableTest.cs

Lines 109 to 130 in 9e8073d

	[Test]
	public void ToDataTableSchemaInDeclarationOrder()
	{
	var dt = this.testObjects.ToDataTable();
	// Assert properties first, then fields, then in declaration order
	Assert.That(dt.Columns[0].Caption, Is.EqualTo("AString"));
	Assert.That(dt.Columns[0].DataType, Is.EqualTo(typeof(string)));
	Assert.That(dt.Columns[1].Caption, Is.EqualTo("ANullableDecimal"));
	Assert.That(dt.Columns[1].DataType, Is.EqualTo(typeof(decimal)));
	Assert.That(dt.Columns[2].Caption, Is.EqualTo("KeyField"));
	Assert.That(dt.Columns[2].DataType, Is.EqualTo(typeof(int)));
	Assert.That(dt.Columns[3].Caption, Is.EqualTo("ANullableGuidField"));
	Assert.That(dt.Columns[3].DataType, Is.EqualTo(typeof(Guid)));
	Assert.That(dt.Columns[3].AllowDBNull, Is.True);
	Assert.That(dt.Columns.Count, Is.EqualTo(4));
	}

[codecov]

Codecov Report

Attention: Patch coverage is 51.35135% with 18 lines in your changes missing coverage. Please review.

Project coverage is 93.23%. Comparing base (bb478ee) to head (2dc247f).

Files	Patch %	Lines
MoreLinq/ToDataTable.cs	51.35%	18 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1070      +/-   ##
==========================================
- Coverage   93.62%   93.23%   -0.40%     
==========================================
  Files         112      112              
  Lines        3374     3400      +26     
  Branches      956      962       +6     
==========================================
+ Hits         3159     3170      +11     
- Misses        199      214      +15     
  Partials       16       16              

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