(WIP) Add id alias

[MarcusGoldschmidt]

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[ggreer]

Is this for a resource, an entitlement, a grant, or all of them? If it's just for one, maybe it can have a name like ResourceAlias and go in annotation_resource.proto.

Also should this have another attribute saying what type of alias it is? eg: ARN, URL, resource id, etc. That attribute could be a string or an enum depending on how you want to use it on the C1 side.

[Bencheng21]

why this one is an array? I think one resource should have one alias? right?