I noticed a mistake in my previous PR open-telemetry#11232; some function calls did
not pass the correct package name in (passing in "metadata" instead of
the intended generated package name). This PR attempts to address the
potential for this mistake to even occur by providing a wrapper
`generateFile` function that automatically uses the generated package
name from the metadata. The original version of the function that
accepts a package name is intact for the templates that are going in the
base package instead of the generated one.