Support Starlib for Starlark runtime

[yhrn]

I'm trying to write a Starlark Kpt function and realized I needed regex and md5 support. Starlib seems to have what I need but I can't load the modules:

load("re.star", "re")

just yields "error: load not implemented by this application".

Is this something you might consider supporting?

I'm sorry if this is already supported, I'm new to Starlark so I might be missing something.

[halvards]

I came across the same issue while trying to manipulate yaml in a block string (nested yaml) using Starlark.

Example: Set values in the data.mesh field in this ConfigMap: https://cloud.google.com/traffic-director/docs/set-up-gke-pods-auto#configuring_the_sidecar_injector