Canonically scoped labels for channels

[liamhuber]

Closes #116

We still string-code the "__" in examples, but I think that's OK since I expect users to be writing this stuff out in their maps anyhow, only #86 will really help that.

The while-loop meta node still uses "__" manually, but in a different context so I'm leaving it.

[github-actions]

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

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.01% (target: -1.00%)	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (20f7b85)	2195	1844	84.01%
Head commit (3eed68e)	2196 (+1)	1845 (+1)	84.02% (+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 (#120)	6	6	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%

See your quality gate settings    Change summary preferences

_{You may notice some variations in coverage metrics with the latest Coverage engine update. For more details, visit the documentation}

[github-actions]

Pull Request Test Coverage Report for Build 7133014409

• 6 of 6 (100.0%) changed or added relevant lines in 2 files are covered.
• 12 unchanged lines in 1 file lost coverage.
• Overall coverage remained the same at 89.307%

---

Files with Coverage Reduction	New Missed Lines	%
channels.py	12	93.12%

Totals
Change from base Build 7132993571:	0.0%
Covered Lines:	3892
Relevant Lines:	4358

---

💛 - Coveralls