Add export option to export_file and export_on_grid

[Samuelopez-ansys]

Close #4383

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[gmalinve]

@Samuelopez-ansys you could add UTs for both.
For the export_field_file there's actually one Icepak test with the sample_points_file if you want.

[Samuelopez-ansys]

@gmalinve I have pushed a new test, but it is not needed to increase the coverage, because if it fails, it will be an exception in the AEDP API, not in PyAEDT. But for safety, I have added one test to cover the non-default values.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 81.64%. Comparing base (66af817) to head (fd4495c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4390   +/-   ##
=======================================
  Coverage   81.64%   81.64%           
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  Files         109      109           
  Lines       52593    52604   +11     
=======================================
+ Hits        42938    42948   +10     
- Misses       9655     9656    +1