aggarwal2000 issues

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                                            aggarwal2000

This PR adds: 1. Batched banded matrix format 2. Batched banded solver

reg:build

reg:testing

reg:example

type:solver

type:matrix-format

mod:all

type:batched-functionality

1:ST:no-changelog-entry

This PR adds: 1. Batched Tridiagonal Matrix Format 2. Batched Tridiagonal Solver (based on Wang and Mou - Parallel Gaussian Elimination algorithm)