Make MesopException the parent class of more specific mesop exception…

…s & expose as public API (#113)

mesop/__init__.py

@@ -111,6 +111,18 @@
 from mesop.events import (
   InputEvent as InputEvent,
 )
+from mesop.exceptions import (
+  MesopDeveloperException as MesopDeveloperException,
+)
+from mesop.exceptions import (
+  MesopException as MesopException,
+)
+from mesop.exceptions import (
+  MesopInternalException as MesopInternalException,
+)
+from mesop.exceptions import (
+  MesopUserException as MesopUserException,
+)
 from mesop.features import page as page
 from mesop.key import Key as Key
 from mesop.pip_package.version import VERSION

mesop/exceptions/__init__.py

@@ -5,16 +5,16 @@ class MesopException(Exception):
   pass
 
 
-class MesopUserException(Exception):
+class MesopUserException(MesopException):
   def __str__(self):
     return f"**User Error:** {super().__str__()}"
 
 
-class MesopInternalException(Exception):
+class MesopInternalException(MesopException):
   def __str__(self):
     return f"**Mesop Internal Error:** {super().__str__()}"
 
 
-class MesopDeveloperException(Exception):
+class MesopDeveloperException(MesopException):
   def __str__(self):
     return f"**Mesop Developer Error:** {super().__str__()}"