Add checks for nonnegative, doubly nonnegative and positive matrices

[purva-thakre]

Description

Fixes #557

Fixes #558

Changes

Notable changes that this PR has either accomplished or will accomplish. Feel free to add more lines to the itemized list below.

• [ ] Change 1

Checklist

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.7%. Comparing base (d80f59a) to head (4b77033).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #645 +/- ## ====================================== Coverage 97.6% 97.7% ====================================== Files 162 165 +3 Lines 3216 3226 +10 Branches 789 789 ====================================== + Hits 3142 3152 +10 Misses 48 48 Partials 26 26 ```

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