Raise a TypeError if a container is used in a region

[adtzlr]

This closes #938. Hopefully useful for things like #936.

Example

>>> import felupe as fem
>>> 
>>> mesh_container = fem.MeshContainer([fem.Rectangle()])
>>> element = fem.Quad()
>>> quadrature = fem.GaussLegendre(order=1, dim=2)
>>> region = fem.Region(mesh_container, element, quadrature)
TypeError: A mesh container is not supported by a region, use a mesh instead.

Hopefully this is clear enough to change it to:

>>> import felupe as fem
>>> 
>>> mesh_container = fem.MeshContainer([fem.Rectangle()])
>>> mesh = mesh_container[0]
>>> element = fem.Quad()
>>> quadrature = fem.GaussLegendre(order=1, dim=2)
>>> region = fem.Region(mesh, element, quadrature)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.19%. Comparing base (0b3a637) to head (2efe19a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #939   +/-   ##
=======================================
  Coverage   97.18%   97.19%           
=======================================
  Files         181      181           
  Lines        6510     6524   +14     
=======================================
+ Hits         6327     6341   +14     
  Misses        183      183           

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