Add LaguerreGaussKernel

[svchb]

In my quick testing this didn't show the claimed accuracy improvement vs Wendland and Quintic.

[codecov]

Codecov Report

❌ Patch coverage is 57.14286% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.88%. Comparing base (d193c71) to head (f800e03).
⚠️ Report is 23 commits behind head on main.

Files with missing lines	Patch %	Lines
src/general/smoothing_kernels.jl	57.14%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #893      +/-   ##
==========================================
- Coverage   65.94%   65.88%   -0.06%     
==========================================
  Files         113      113              
  Lines        7852     7880      +28     
==========================================
+ Hits         5178     5192      +14     
- Misses       2674     2688      +14     

Flag	Coverage Δ
unit	65.88% <57.14%> (-0.06%)	⬇️

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[svchb]

The normal smoothing kernel test that we have doesn't work here since the truncation error is too large.

[efaulhaber]

The normal smoothing kernel test that we have doesn't work here since the truncation error is too large.

The Gauss kernel is also truncated. Why can't you run the same tests for this kernel?

[svchb]

The normal smoothing kernel test that we have doesn't work here since the truncation error is too large.

The Gauss kernel is also truncated. Why can't you run the same tests for this kernel?

I can but the errors seem to be unreasonable because they are larger than 1.