Grokcore.component

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- Nothing changed yet.

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- Adjust discriminator for adapters so it matches the one used by the
``zope.component`` ZCML directive (``<adapter factory=""/>``) and thus a
conflict error is raised if there are two registrations for the same
discriminator.

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- Upgrade to support ``zope.interface >= 6.0`` by no longer importing removed
functions:

+ ``classProvides``
+ ``implementsOnly``

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- Add support for Python 3.10, 3.11.

- Drop support for Python 2.7, 3.5, 3.6.

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- Add support for Python 3.7 up to 3.9.

- Update to ``zope.component >= 5``.

- Drop support for Python 3.4.

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- Expose ``martian.ignore`` through our API.