Add Betasampler

[YichengDWu]

No description provided.

[codecov]

Codecov Report

Patch coverage: 81.08% and project coverage change: +29.00 🎉

Comparison is base (a334953) 30.05% compared to head (f703cb8) 59.05%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #202       +/-   ##
===========================================
+ Coverage   30.05%   59.05%   +29.00%     
===========================================
  Files          15       15               
  Lines         985     1016       +31     
===========================================
+ Hits          296      600      +304     
+ Misses        689      416      -273     

Impacted Files	Coverage Δ
src/Sophon.jl	100.00% <ø> (ø)
src/pde/discretize.jl	36.66% <50.00%> (+36.66%)	⬆️
src/pde/utils.jl	38.88% <66.66%> (+38.88%)	⬆️
src/pde/pinnsampler.jl	17.50% <84.00%> (+17.50%)	⬆️
src/pde/sym_utils.jl	81.92% <100.00%> (+81.92%)	⬆️

... and 3 files with indirect coverage changes

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