Fix #136

[putianyi889]

• long compilation time for Jacobi(m,n) \ Jacobi(0,0) #136

After this PR:

julia> @time Jacobi(100,100) \ Jacobi(0,0);
  0.044945 seconds (2.79 k allocations: 263.168 KiB)

Note that getindex is still very slow due to LazyArrays.jl.

Weighted Jacobi conversion is not fixed.

[codecov]

Codecov Report

Patch coverage: 94.73% and project coverage change: +0.08% 🎉

Comparison is base (aaa182b) 91.76% compared to head (cac0897) 91.84%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #145      +/-   ##
==========================================
+ Coverage   91.76%   91.84%   +0.08%     
==========================================
  Files          17       17              
  Lines        1822     1840      +18     
==========================================
+ Hits         1672     1690      +18     
  Misses        150      150              

Files Changed	Coverage Δ
src/classical/jacobi.jl	90.27% <94.73%> (+0.64%)	⬆️

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[dlfivefifty]

Can you add tests to cover the two remaining cases?