Banded QR for non square matrices

[codecov[bot]]

Codecov Report

Merging #401 (718557e) into main (4ee3e1e) will decrease coverage by 7.23%. Report is 6 commits behind head on main. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #401      +/-   ##
==========================================
- Coverage   69.05%   61.82%   -7.23%     
==========================================
  Files          26       26              
  Lines        1929     1941      +12     
==========================================
- Hits         1332     1200     -132     
- Misses        597      741     +144     

Files	Coverage Δ
ext/LinearSolveBandedMatricesExt.jl	83.33% <100.00%> (+83.33%)	:arrow_up:

... and 10 files with indirect coverage changes

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[ChrisRackauckas]

Test?