Improve `FindMinimum, FindMaximum` with more hipparchus methods

[axkr]

The following methods should be implemented for the FindMinimum, FindMaximum functions:

• "Powell"

Implements the Powell optimizer.

This should be the default method, if no Method is set.

• "ConjugateGradient"

Implements the Non-linear conjugate gradient optimizer.
This is a derivative based method and the functions must be symbolically differentiable.

• "SequentialQuadratic"

Implements the Sequential Quadratic Programming optimizer.

This is a derivative, multivariate based method and the functions must be symbolically differentiable.

• "BOBYQA"

Implements Powell's BOBYQA optimizer (Bound Optimization BY Quadratic Approximation).

See:

• https://github.com/axkr/symja_android_library/blob/master/symja_android_library/doc/functions/FindMinimum.md
• https://github.com/axkr/symja_android_library/blob/master/symja_android_library/doc/functions/FindMaximum.md