Callable Types & Post Init Hooks

[ncilfone]

What does this PR do?

• Adds support for typing.Callable types
• Adds post init hooks to run validation on the instantiated classes
• Adds some common validations to utils
• Additional unit tests.
• Updates all unit tests to include python 3.10

Checklist

• Did you adhere to PEP-8 standards?
• Did you run black and isort prior to submitting your PR?
• Does your PR pass all existing unit tests?
• Did you add associated unit tests for any additional functionality?
• Did you provide documentation (Google Docstring format) whenever possible, even for simple functions or classes?

[coveralls]

Pull Request Test Coverage Report for Build 1971099697

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 82 of 89 (92.13%) changed or added relevant lines in 7 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.04%) to 96.031%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
spock/backend/field_handlers.py	20	22	90.91%
spock/utils.py	32	37	86.49%

Totals
Change from base Build 1934893813:	0.04%
Covered Lines:	1839
Relevant Lines:	1915

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💛 - Coveralls