Move the files submodule over to snippets

[liamhuber]

It only depends on pathlib and seems generically useful to me, so off to snippets it goes!

[github-actions]

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

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (85f153d)	2572	2195	85.34%
Head commit (35b6d77)	2572 (+0)	2195 (+0)	85.34% (+0.00%)

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 (#158)	1	1	100.00%

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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