feat: support only build specified environment

[9aoy]

Summary

By default, Rsbuild will build all environments in the Rsbuild configuration. User can build only the specified environment via cli --environment <name> option.

eg.

# Enable build for all environments by default
rsbuild dev

# Only enable web environment build
rsbuild dev --environment web

# Enable web and ssr environment build
rsbuild dev --environment web --environment ssr

Related Links

#2620

Checklist

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

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