Automatic type dispatching for python wrappers

[schnellerhase]

In #3542 it was commented by @jhale that the selection of cpp-types of python wrappers can be unified and should not require a custom handling in each wrapper.

Given a dtype and a list of exported dtype's we are able to determine the underlying cpp-type programmatically or throw (if not exported/supported).

Wrapper classes that share this:

• FiniteElement
• CoordinateElement
• DirichletBC
• Form
• Constant
• Function
• Expression
• FunctionSpace
• BoundingBoxTree
• AdjacencyList
• MatrixCSR
• Vector
• (probably some more that were missed)