Value validation

[liamhuber]

Validate value assignments against type hints. Since this could possibly be a bit expensive (I haven't noticed it so far), I also added node-level shortcuts for turning (on)off type checking at all levels beneath that node. The idea is to leave it in place by default, then if a user has a workflow they're very happy with they disable the checking before submitting it for production runs.

Closes #50

TODO:

• Update docstring examples (or at least verify they don't need updating)
• Update example notebook (as above)

[github-actions]

👈 Launch a binder notebook on branch pyiron/pyiron_workflow/value_validation

[github-actions]

Pull Request Test Coverage Report for Build 6756788069

• 30 of 32 (93.75%) changed or added relevant lines in 5 files are covered.
• 66 unchanged lines in 6 files lost coverage.
• Overall coverage decreased (-0.2%) to 87.58%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pyiron_workflow/io.py	2	4	50.0%

Files with Coverage Reduction	New Missed Lines	%
io.py	2	88.55%
macro.py	7	89.41%
node.py	9	87.15%
function.py	12	90.7%
channels.py	13	91.3%
composite.py	23	89.08%

Totals
Change from base Build 6750383642:	-0.2%
Covered Lines:	3279
Relevant Lines:	3744

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💛 - Coveralls

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.40% (target: -1.00%)	58.82%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (24c88e0)	1880	1539	81.86%
Head commit (a52d8c8)	1893 (+13)	1542 (+3)	81.46% (-0.40%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#66)	34	20	58.82%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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