move sub_factorize from MultivariateOrthogonalPolynomials.jl

[dlfivefifty]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.55%. Comparing base (7f1e4af) to head (736c5a1).

Files with missing lines	Patch %	Lines
src/bases/bases.jl	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #230      +/-   ##
==========================================
+ Coverage   93.52%   93.55%   +0.03%     
==========================================
  Files          12       12              
  Lines        1019     1024       +5     
==========================================
+ Hits          953      958       +5     
  Misses         66       66              

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[dlfivefifty]

@copilot increase coverage

[Copilot]

@copilot increase coverage

Added coverage for:

• ProjectionFactorization \ AbstractQuasiMatrix (the multi-RHS backslash) in the spline transform tests
• _sub_factorize(::Tuple{Any,Any}, ...) dispatches (both OneTo and general jr) by introducing an InfChebyshev infinite-dimensional basis in the Chebyshev tests

Commit: increase coverage for sub_factorize and ProjectionFactorization