Refactoring of CField struct to include gridindexingtype and interp_method

[erikvansebille]

Following #1612, where we need to provide the gridindexingtype on the CField struct for technical reasons, it makes sense to also use it throughout the rest of the C-code. Hence, this PR refactors the code to not require the gridindexingtype and interp_method when calling a Field evaluation in C, but get them from the CField itself

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Additional details and impacted files

@@                     Coverage Diff                     @@
##           analyticaladvection_in_jit    #1673   +/-   ##
===========================================================
  Coverage                       86.22%   86.22%           
===========================================================
  Files                              67       67           
  Lines                           11827    11828    +1     
===========================================================
+ Hits                            10198    10199    +1     
  Misses                           1629     1629           

Flag	Coverage Δ
integration-tests	64.85% <100.00%> (+<0.01%)	:arrow_up:
unit-tests	80.62% <100.00%> (+<0.01%)	:arrow_up:

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Files with missing lines	Coverage Δ
parcels/field.py	89.72% <100.00%> (+<0.01%)	:arrow_up:

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[erikvansebille]

Will be solved in v4