[bluemath_tk\interpolation\rbf.py] Optimize RBF interpolator

[tausiaj]

Optimize RBF interpolator class in bluemath_tk\interpolation\rbf.py.
After several usages of the package, it takes a lot of time when thousands of data points are passed to the function.
This is a time example with 6000 points:
2024-12-16 16:50:53,756 - RBF - INFO - Optimal sigma: 0.36305813858503644 - Time: 11000.97 seconds

We discovered a function in scipy that could help the optimization:
https://docs.scipy.org/doc/scipy/reference/generated/scipy.interpolate.RBFInterpolator.html#scipy.interpolate.RBFInterpolator

Or maybe threads implementaion could help!

[tausiaj]

After having the first look to the scipy function, we prooved it reduces optimization time by orders of magnitude, will close this issue soon!