refactor: split asdf into backend+plugin

[jdx]

No description provided.

[github-actions]

Package	Line Rate	Complexity	Health
src.backend	67%	0	➖
src	87%	0	✔
src.cli	82%	0	✔
src.cli.alias	89%	0	✔
src.cli.args	97%	0	✔
src.cli.backends	95%	0	✔
src.cli.cache	95%	0	✔
src.cli.config	92%	0	✔
src.cli.direnv	80%	0	✔
src.cli.generate	87%	0	✔
src.cli.plugins	85%	0	✔
src.cli.settings	93%	0	✔
src.cli.sync	58%	0	➖
src.cli.tasks	71%	0	➖
src.config.config_file	89%	0	✔
src.config	88%	0	✔
src.plugins	82%	0	✔
src.plugins.core	55%	0	➖
src.shell	98%	0	✔
src.toolset	86%	0	✔
src.ui	63%	0	➖
Summary	80% (13911 / 17372)	0	✔

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.03%	✅ 77.39%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (15fbf0c)	17299	13857	80.10%
Head commit (02924f2)	17372 (+73)	13911 (+54)	80.08% (-0.03%)

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 (#2226)	482	373	77.39%

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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