Nested packages

[liamhuber]

The node creator now allows you to register entire packages instead of just a single module. Access is then chained with the same semantic paths as the package.

Each non-package submodule is required to have a nodes: list[Node] attribute inside it; I'm open to changing that in the future, e.g. to simply look in each module for such an attribute (or maybe something more specific like pyiron_workflow_nodes) and pass silently if it's not there. But in the meantime this gives us sub-modules with the minimal change to the API promises/expectations.

E.g. now:

from pyiron_workflow import Workflow

Workflow.register("atomistics", "pyiron_workflow.node_library.atomistics")

wf = Workflow("ev_curve")

wf.structure = wf.create.atomistics.task.Bulk("Al")
wf.calculator = wf.create.atomistics.calculator.Emt()
...

closes #104.

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Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.05% (target: -1.00%)	✅ 95.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (e67b986)	2440	2072	84.92%
Head commit (a55eda4)	2448 (+8)	2080 (+8)	84.97% (+0.05%)

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 (#133)	20	19	95.00%

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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[coveralls]

Pull Request Test Coverage Report for Build 7173710830

• 24 of 24 (100.0%) changed or added relevant lines in 1 file are covered.
• 12 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.04%) to 89.916%

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Files with Coverage Reduction	New Missed Lines	%
interfaces.py	12	85.45%

Totals
Change from base Build 7153993170:	0.04%
Covered Lines:	4405
Relevant Lines:	4899

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