Add more quadrature rules (Trapezoid, Simpson,...)

[DomiDre]

Following @mxxo suggestion in #4 it makes sense to add additional quadrature schemes such as Trapezoid and Simpson rule.

If nobody wants to take it on first, I would look into it the following week!

[mxxo]

I added a midpoint rule draft to kick things off (#9) 🚀

[mtantaoui]

Hello, I did implement some of those methods on my crate, i'd be happy to help implement those. Apparently, we used the same methods for Gauss-Laguerre and Gauss-Legendre.

[JSorngard]

Ooh, your crate looks very nice, so that would be very welcome!

[JSorngard]

I made a previous attempt at Gauss-Chebyshev in the chebyshev branch, but I was not very happy with it. Your implementation in integrate that has two versions of the rule as separate functions seems like a much better API.

[JSorngard]

I don't think #97 completed this, just partially addressed it.

[JSorngard]

Issue #111 is related to this one.