Add Ferrite.jl's old default edge and face dof indices functions

[KnutAM]

This is a workaround for #32 to make FerriteInterfaceElements.jl unaffected by new default implementations in Ferrite-FEM/Ferrite.jl#1293. #32 is not closed by this, since it does seem like the current implementation is incorrect (but this PR doesn't change the current implementation).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.69%. Comparing base (42da30d) to head (db5053c).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
+ Coverage   88.61%   88.69%   +0.08%     
==========================================
  Files           5        5              
  Lines         281      283       +2     
==========================================
+ Hits          249      251       +2     
  Misses         32       32              

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[KnutAM]

- addcellset!(grid, "bottom", Set((1,2,3,4)))
+ addcellset!(grid, "bottom", OrderedSet((4, 2, 3, 1)))

The change in order was done by creating the old Set (which passes tests on v11), and checking the created OrderedSet with getcellset, which had a different order. The two other sets kept their order, so changed only to using OrderedSet to guarantee keeping this order.

Edit: Same for 3d

Edit2: Didn't seem to work, unrelated to this PR so opening issue instead.