Add an explicit Runge-Kutta method to applications

[Ravenwater]

explicit Runge-Kutta solver with parameterized number of stages leveraging posits and quire to improve accuracy.

https://en.wikipedia.org/wiki/Runge%E2%80%93Kutta_methods

[Ravenwater]

in applications/ode there is a RK4 implementation. Add a generalized RK solver and design good test/demonstration cases.