Add --development and --source-map flags for building extensions. #8961
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References
Fixes #8952
Code changes
By default, we build a lab extension in production mode (and without large source maps).
The development flag implies the source-map flag.
The --source-map flag is there so that you can generate source maps even in production mode, for debugging problems that may appear in production mode, or in case you really want to distribute source map files in your package.
User-facing changes
Backwards-incompatible changes