Add a parameter to solvers to control step size update scheme.

[rickvanveen]

Is your feature request related to a problem? Please describe.
Currently, there is no way to change the step_size update scheme of the SteepestGradientDescent solver.

Describe the solution you'd like
Instead of the now hard coded scheme enable changing the scheme through a parameter that can be passed through to the solver.

Describe alternatives you've considered
There are not alternatives, other then copying/forking the code and changing the scheme in the code.

Additional context
N/a