feat: add transform-imports plugin

[sapphi-red]

This PR adds @rolldown/plugin-transform-imports which utilizes Rolldown's native magic string feature.

In the synthetic benchmark included in this PR, this plugin is

• 1.36x faster than using @swc/plugin-transform-imports + @rollup/plugin-swc
• 2.91x faster than using babel-plugin-transform-imports + @rolldown/plugin-babel

The implementation is based on swc-project/plugins/packages/transform-imports (Apache License 2.0) and test cases are also adapted from it.

Normally, the lazy barrel feature in Rolldown (currently experimental) resolves the performance problem. But in some edge cases, this plugin can improve the performance further by ignoring minor semantics.

[pkg-pr-new]

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@rolldown/plugin-babel

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@rolldown/plugin-emotion

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@rolldown/plugin-jsx-remove-attributes

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oxc-unshadowed-visitor

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@rolldown/plugin-styled-jsx

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@rolldown/plugin-transform-imports

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commit: f790660