Extract C-contiguous arrays by default from fields

[adtzlr]

closes #857.

Example

>>> import felupe as fem
>>> 
>>> mesh = fem.Cube(n=11).triangulate().add_midpoints_volumes(cell_type="tetra")
>>> region = fem.RegionTetraMINI(mesh)
>>> field = fem.FieldsMixed(region, n=3)
>>> 
>>> field.extract()[0].flags
  C_CONTIGUOUS : True
  F_CONTIGUOUS : False
  OWNDATA : True
  WRITEABLE : True
  ALIGNED : True
  WRITEBACKIFCOPY : False

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.55%. Comparing base (2961ad1) to head (78dee44).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #856   +/-   ##
=======================================
  Coverage   97.55%   97.55%           
=======================================
  Files         149      149           
  Lines        5732     5735    +3     
=======================================
+ Hits         5592     5595    +3     
  Misses        140      140           

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