"any" HandleType

[Bartasus1]

Hey!

I think it might be benefitial to add any option to the HandleType.
It would be useful mainly with ConnectionMode.Strict, where we would want to keep the strict flow for certain handles.
Worth noting that it still would be resolveable to source -> target relationship for the edges, just allowing developers to create sub-flows where they don't care for the direction.
For example in a geneaology tree, where we care for the parent->child flow, but not so much for the spouse-spouse relationship.

What do you think?