[patch] Add a utility to the API for finding node classes

[liamhuber]

Per @JNmpi's request pyiron/pyironFlow@679faf3#r146023624

TODO:

• unit test
• demo it somewhere? Maybe the deepdive? It's "hidden" (private) in the API. If the interface settles (next point) we can demo it then.
• Recursion? Instead of a list we probably want to walk the source and return a nested dictionary. A per-module version is already a step forward. It can be used in pyiron-xyflow (or elsewhere) and we can migrate walking code here if it gets written.

[github-actions]

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

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.01% (target: -1.00%)	✅ 92.86%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (8dc719b)	3099	2830	91.32%
Head commit (732bb46)	3127 (+28)	2856 (+26)	91.33% (+0.01%)

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 (#439)	28	26	92.86%

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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[coveralls]

Pull Request Test Coverage Report for Build 10693654494

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.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.01%) to 91.334%

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Totals
Change from base Build 10585647738:	0.01%
Covered Lines:	2856
Relevant Lines:	3127

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💛 - Coveralls