feat: support read environments source.entry config

[9aoy]

Summary

support read environments source.entry config

export default defineConfig({
      environments: {
          web: {
            source: {
              entry: {
                index: './src/index.client',
              },
            },
          },
          ssr: {
            source: {
              entry: {
                index: './src/index.ssr',
              },
            },
          },
        },
      },
});

Related Links

#2620

Checklist

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

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