add SDLR, wip

[fsxbhyy]

Added Symmetrized DLR that deals with symmetric and antisymmetric parts simultaneously.

• Add builder for SDLR grid
• Add function that build over complete symmetric grids based on SDLR grid -Add Fourier transform for fermions. Bosons still work in progress -Tests are currently put in sym_test.jl. Will move them to the standardized test after cleaning up old code.

[codecov-commenter]

Codecov Report

Merging #31 (026bb57) into main (39d03ea) will decrease coverage by 4.02%. The diff coverage is 22.62%.

@@            Coverage Diff             @@
##             main      #31      +/-   ##
==========================================
- Coverage   57.91%   53.89%   -4.03%     
==========================================
  Files          13       13              
  Lines        1283     1401     +118     
==========================================
+ Hits          743      755      +12     
- Misses        540      646     +106     

Impacted Files	Coverage Δ
src/dlr.jl	60.45% <16.66%> (-23.42%)	:arrow_down:
src/spectral.jl	74.59% <17.64%> (-5.88%)	:arrow_down:
src/operation.jl	80.48% <26.31%> (-16.49%)	:arrow_down:
src/discrete/builder.jl	66.66% <100.00%> (+0.45%)	:arrow_up:
src/discrete/kernel.jl	84.34% <100.00%> (ø)

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