Add support for projecting method groups

[Flamage82]

This adds support for projecting method groups, closing #62.

For example:

[Projectable]
public static ProgramDto ProgramToDto(Program p) => new(
    p.Projects.Select(ProjectToDto),

There is a new test covering the basic functionality, and this change functions correctly in my own solution. I wasn't able to create a scenario where CreateDelegate wasn't wrapped by a Convert expression, hence the long expression pattern.

[koenbeuk]

Thanks!

[PhenX]

Hello @koenbeuk any ETA for a new release with this fix ? :)