Grokcore.error

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- Nothing changed yet.

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- Drop support for Python 2.7, 3.4, 3.5, 3.6.

- Add support for Python 3.7, 3.8, 3.9, 3.10, 3.11.

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- Downpin mock test dependency for python2.7.

- Replace grok.implements() with grok.implementer()

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- Python 3 compatibility.

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- Update information sent to Sentry.

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- When there is no principal in the request, don't send the 'user' sentry
information.

- Note: 0.4 got lost between an internal and a public release.