feat: support add plugins for specified environment

[9aoy]

Summary

Support add plugins for specified environment.

For example, enable the react plugin only in the web environment:

import { pluginReact } from '@rsbuild/plugin-react';

export default {
  environments: {
    web: {
      output: {
        target: 'web',
      },
      plugins: [pluginReact()],
    },
    node: {
      output: {
        target: 'node',
      },
    },
  },
};

TODO: Some plugins do not yet support single-environment registration because they use api.modifyRsbuildConfig hook to modify the global configuration.

Related Links

#2620

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[chenjiahan]

Awesome 🎉