Improve metapath exceptions for v3.0.0

[david-waltermire]

Committer Notes

Improve the overall Metapath exception hierarchy.

• Create specialized exceptions for common error codes.
• Reduce "wrapping" of MetapathExceptions to flatten the underlying cause.

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[aj-stein-gsa]

I found one typo in a file name and an otherwise confusing doc string but all straightforward and solid. I am happy to approve this one now. It's up to you if you need me review again if you want to fix the file name but it's very minor.