feature: `fromSourcemap` option in per-place push mappings

[Ransomwave]

Currently, Azul does not feature a way to encode sourcemap configuration inside per-place configuration.

This forces you to have to manually go through the interactive menu or manually specify --from-sourcemap.

We should

• Introduce a field in the per-place configuration that allows you to set a path for the sourcemap to push from. For example:

fromSourcemap = "./sourcemap.json"

• Get rid of the interactive sourcemap dialogue if the user wants to use place config from Studio.