Euclidean condition number

[dallan-keylogic]

Summary/Motivation:

Presently, the diagnostic toolbox uses the Frobenius condition number for report_numerical_issues. However, calculating that condition number requires forming the (pseudo) inverse of the Jacobian, which is inevitably a dense matrix. Consequently, it is extremely slow for larger models. This PR adds the option to calculate the 2-norm condition number, making use of the SVD method added by #1566.

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[ksbeattie]

Needs #1566