[FR]: Add support for assetName esbuild API

[KatSick]

What is the current behavior?

If I define assetNames in config, a new folder will be created in Bazel output, but the folder is not included in the rule's output. It means it is impossible to manage it or use it with output_dir=False.

Describe the feature

It would be great to add support for assetNames to specify the assets output folder (needed for GitLab Pages website deployment under the custom path).

In theory, we can add something like output_assets=Label() in order to get assets from esbuild

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[gregmagolan]

Hmmm. Perhaps the correct API should be out_dirs to be able to specify multiple expected output dirs. This is what the API we went with in js_run_binary.

This could be added in a non-breaking fasion.

[KatSick]

sounds good to me