Simplify element creation (#503)

* Basix branch

* remove code that's moved to Basix

* flake

* update types

* ufcx

* quadrature element

* corrections

* updates

* family_name

* cell name

* cell name

* family_name

* value_shape

* remove todo that's now in basix

* value_shape

* __eq__ and __hash__

* degree

* space

* value_shape

* value shape

* ()

* simplify

* fix VectorElement(QuadratureElement(...))

* use basix main

Co-authored-by: Garth N. Wells <gnw20@cam.ac.uk>