feat(linear_algebra/quadratic_form/basic): `linear_map.comp_quadratic_form` (#10950)
feat(linear_algebra/quadratic_form/basic): `linear_map.comp_quadratic_form` (#10950)

The name is taken to mirror `linear_map.comp_multilinear_map`







leanprover-community/mathlib,leanprover-community/mathlib