Base knife-edge scan analysis implementation

Hi @lleguy @mercadil,

This is an example of a base implementation, specifically the knife edge scan analysis from Laurent's tb.knife_edge. This is agnostic from xarray data format, thus this can be easily used on other means, such as on a Karabo device.

I also have found out that there could be problems with using bisect especially with repetitive elements. I use slicing instead to find the valid range.

src/toolbox_scs/routines/__init__.py

 from .XAS import *
 
 # Module name is the same as a child function, we use alias to avoid conflict
-import knife_edge as knife_edge_module
+import toolbox_scs.routines.knife_edge as knife_edge_module
 from .knife_edge import *
 
 __all__ = (
     knife_edge_module.__all__
-    * XAS.__all__
+    + XAS.__all__
 )