Allow skipping of IEquatable<T> and comparison operators

[thomashilzendegen]

This should implement #15

[PawelGerr]

The flag should disable all equality relevant stuff, like Equal(object), Equals(T), GetHashCode, equality operators == and !=, and comparison operators <, <=, >, >=. (IComparable stays untouched by this flag)
Especially GetHashCode must not be generated otherwise the types most likely are unusable with a Dictionary. Introducing another flag SkipGetHashCode is unnecessary because they should be implemented together.

Detailed Feedback

UnionAttribute, UnionAttributeBase, ValueObjectAttributeBase:

• Attribute property SkipEqualsMethod should be renamed to SkipEqualityComparison
• The xml docs should be adjusted that Equals, GetHashCode, equality comparison operators and comparisons operators will not be implemented

ValueObjectAttribute:

• When SkipEqualityComparison is set to true then EqualityComparisonOperators and ComparisonOperators must return EqualityComparisonOperators.None

ThinktectureRuntimeExtensionsAnalyzer:

• When SkipEqualityComparison is set to true then the analyzer must not trigger DiagnosticsDescriptors.StringBasedValueObjectNeedsEqualityComparer nor DiagnosticsDescriptors.ComplexValueObjectWithStringMembersNeedsDefaultEqualityComparer
  • tests

AdHocUnionSettings, AllValueObjectSettings, ValueObjectSettings:

• Property SkipEqualsMethod should be renamed to SkipEqualityComparison

AllValueObjectSettings:

• When SkipEqualityComparison is set to "true" then EqualityComparisonOperators and ComparisonOperators must be set to None
  • tests

AdHocUnionCodeGenerator, ComplexValueObjectCodeGenerator:

• When SkipEqualityComparison is set to "true" then
  • we must not generate Equals, equality operators and GetHashCode, i.e. these 3 methods must not be invoked: GenerateEqualityOperators, GenerateEquals and GenerateGetHashCode
  • the type must not have global::System.IEquatable<T> nor global::System.Numerics.IEqualityOperators<T, T, bool>
  • tests

KeyedValueObjectCodeGenerator:

• When SkipEqualityComparison is set to "true" then
  • we must not generate Equals nor GetHashCode, i.e. these 2 methods must not be invoked: GenerateEquals and GenerateGetHashCode
  • the type must not have global::System.IEquatable<T> nor global::System.Numerics.IEqualityOperators<T, T, bool>
  • tests

[thomashilzendegen]

Sure, I get your idea. My idea was to rely on the remaining implementation and only skip especially the typed Equals method. Maybe this is too specific for my use case... I will change this PR to the requested feature amount.