refactor: reorgnize histplot logic (#352)

* refactor: reorgnize histplot logic

* chore: cleanup

Author: andrzejnovak

setup.cfg

@@ -55,6 +55,7 @@ files = src
 python_version = 3.7
 warn_unused_configs = True
 
+allow_redefinition = True
 # disallow_any_generics = True
 # disallow_subclassing_any = True
 # disallow_untyped_calls = True