refactor: factor out maputils

[acpana]

Proof of concept of sharing the map utils and other utils across all the direct package.

[acpana]

/hold

A few more places that can be factored out if this is something we want to do!

[yuwenma]

Actually I think we shall move the cbwp mapping to the direct controller dir (but since we are still developing the mapper tool, this may not be done anyways 😆 ).

[acpana]

I don't mind taking on the tooling changes for this too.

[acpana]

Also I think it makes sense to do this now as we are starting to add more resources as opposed to doing it later.

[google-oss-prow]

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[acpana]

/hold cancel

can follow up in more places to factor out and make template changes