Introduce GramMatrixPolynomial

[dlfivefifty]

This will support making an orthogonal polynomial whose Jacobi matrix is deduced from GramMatrix in FastTransforms.jl

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (8be0b52) to head (fd138ca).

Files with missing lines	Patch %	Lines
src/choleskyQR.jl	0.00%	9 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (8be0b52) and HEAD (fd138ca). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (8be0b52)	HEAD (fd138ca)
	6	5

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #226       +/-   ##
==========================================
- Coverage   92.10%   0.00%   -92.11%     
==========================================
  Files          19      19               
  Lines        1863    1826       -37     
==========================================
- Hits         1716       0     -1716     
- Misses        147    1826     +1679     

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