[FEATURE] Add possibility to user set a smoothing filter in the output map (reconstruction module)

[acsenrafilho]

Is your feature request related to a problem? Please describe.
It is usually applied a spatial filter (smoothing) in the output maps. Then, it could be nice to have this option active (and with possibility to choose the kind of spatial filter it could be used)

Describe the solution you'd like
Think in an additional parameter to be set in the reconstruction module that can give a smoothing filter in the create_map method.

Additional context
If this is not the case for the general concept of reconstruction module classes, then it could be interesting to create a new module that can apply it (a smoothing module?)