add function based constructor for band matrix and insertLocalTiles#214

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jamabr wants to merge 5 commits intoicl-utk-edu:masterfrom jamabr:band_matrix_constructor

Commits on Jan 28, 2025

add function based constructor for band matrix and insertLocalTiles
jamabr
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Commits on Feb 5, 2025

unit test: function based constructor for BandMatrix (taken from Matrix)
jamabr
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Commits on Feb 6, 2025