refactor: split asdf into forge+plugin

[github-actions[bot]]

Package	Line Rate	Complexity	Health
src	87%	0	✔
src.cli	83%	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	86%	0	✔
src.cli.settings	93%	0	✔
src.cli.sync	29%	0	❌
src.cli.tasks	71%	0	➖
src.config.config_file	89%	0	✔
src.config	87%	0	✔
src.forge	78%	0	✔
src.plugins	90%	0	✔
src.plugins.core	56%	0	➖
src.shell	98%	0	✔
src.toolset	86%	0	✔
src.ui	64%	0	➖
Summary	81% (13630 / 16732)	0	✔

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: -0.11%	:white_check_mark: 83.33%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (8e774ba44e933eedfb999259d1244d589fc7d847) | 16644 | 13576 | 81.57% | | | Head commit (a93003b50057245cbbb3fd1304cf802be3ea9ce6) | 16732 (+88) | 13630 (+54) | 81.46% (**-0.11%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#2225) | 114 | 95 | **83.33%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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