Less Bounds Checks on Matrix Operations

[bhgomes]

• Reduces the number of checks when computing is_identity and is_symmetric

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• Linked to an issue with discussion and accepted design OR have an explanation in the PR that describes this work.
• Added one line describing your change in CHANGELOG.md and added the appropriate changelog label to the PR.
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• Checked that changes and commits conform to the standards outlined in CONTRIBUTING.md.
• Ran cargo hakari generate to update the workspace-hack system