implemented scipy.sparse.isspmatrix_csr

[humzakt]

PR Description

implemented scipy.sparse.isspmatrix_csr

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[github-actions]

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[umairjavaid]

you also have to implement the test function :)

[ivy-seed]

This PR has been labelled as stale because it has been inactive for more than 7 days. If you would like to continue working on this PR, then please add another comment or this PR will be closed in 7 days.

[github-actions]

Thank you for this PR, here is the CI results:

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This pull request does not result in any additional test failures. Congratulations!

[Sam-Armstrong]

@humzakt we also need to implement a test to get this frontend function merged