Add reverse mapping support

[Kataane]

Add Reverse Mapping Support

Description

Implements reverse mapping functionality for Mapperly with a new Reverse property on IncludeMappingConfigurationAttribute. Automatically swaps source/target types and reverses member configurations for bidirectional mapping.

Key changes:

• Added IReversible<T> interface pattern
• Enhanced configuration reader with reverse logic
• Comprehensive test coverage (9 scenarios)
• Maintains backward compatibility

Fixes # (issue)

Checklist

• Code style followed
• Commit message follows guidelines
• Self-review completed
• Code commented where needed
• Documentation updated
• Unit tests added/updated
• Integration tests added/updated

Example

[MapProperty(nameof(Product.Price), nameof(ProductDTO.PriceInEuro))]
public static partial ProductDTO ToDTO(this Product source);

[IncludeMappingConfiguration(nameof(ToDTO), Reverse = true)]
public static partial Product ToProduct(this ProductDTO source);

#1250

[Kataane]

For some reason, the test failed after I merged the main branch to my branch :(

Update: this configuration no longer works.

[MapProperty(nameof(Product.Discounts.EndUsers), nameof(ProductDTO.Discount))]