fix type error in grid generators and add some test functions for gri…

[Abdelrahman912]

Summary

This PR fixes type conversion issues in the generate_grid function in grid_generators.jl and adds test coverage for all grid generators.

Tests

• Added new test cases in test/test_grid_generators.jl.
• Verified that all tests pass locally.

[termi-official]

Thanks for putting this together @Abdelrahman912 ! I left a few minor comments. It should be good to go afterwards.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.69%. Comparing base (c33a191) to head (a93ca25).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #973   +/-   ##
=======================================
  Coverage   93.69%   93.69%           
=======================================
  Files          36       36           
  Lines        5438     5440    +2     
=======================================
+ Hits         5095     5097    +2     
  Misses        343      343           

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[KnutAM]

Nice 🎉
Just two small drive-by comments from me

1. I think it is more logical to take the type parameter from the node than the left point (even if this is equivalent, but seeing that requires looking at the call site)
2. I think it is better to convert and then do division by integer. For Float32 it doesn't matter (only perf), but for higher precision floats it makes a difference

[KnutAM]

Nice, just left some comments on the testing

[KnutAM]

Great work on your first PR @Abdelrahman912 🚀

Content-wise this looks good to me now, just some formatting fixes as commented below, and the pre-commit action should pass. See #928 for detail on how to do that automatically.