Add Intersects function to constraints

[Vilsol]

Add an intersects function to check for intersects between two different constraints.

Follows the same logic as npm semver intersection detection.

I had to add an "expansion" step for tilde and caret operators to simplify the logic.

I have added additional test cases for this.

[Code42Cate]

Are there any plans to implement/merge this? I'm wondering if I should wait for it or just implement it myself :D