Merge branch 'tisaac/feature-lmvm-rework' into 'main'

MatLMVM rework

See merge request petsc/petsc!6401

MatLMVM: Add LMBasis object for cyclically-indexed limited-memory sets of basis vectors

Feautures:

- Runtime handling of work vectors so that they do not have to be added to struct definitions
- Ma

MatLMVM: Add LMBasis object for cyclically-indexed limited-memory sets of basis vectors

Feautures:

- Runtime handling of work vectors so that they do not have to be added to struct definitions
- MatMultColumnRange() used internally to use gemv-like and gemm-like methods
- Specifying a cached product to avoid recomputation (will be useful in the `MatUpdate(B, x, g); MatSolve(B, g, p)` quasi-Newton pattern)

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