Terraform validator: auto-generated mappers

[melinath]

We are currently auto-generating support for a large number of resources in terraform-google-conversion, but support for those resources is not automatically added to Terraform Validator. There is a longstanding TODO to autogenerate the list of mappers. We should do that.

This would probably look something like:

1. generate this list in MM (probably needs to be exported by terraform-google-conversion)
2. Switch terraform-validator to use the new list of mappers.

This could also be a good time to find a better name than "mappers".

[melinath]

We would also want to autogenerate tests for the new items; not sure how that would work. Might require merging the two repos (which we had talked about doing but wasn't a priority at the time.)

[melinath]

This is a duplicate of GoogleCloudPlatform/terraform-validator#217 and GoogleCloudPlatform/terraform-validator#232

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