Some fields in GCP are not mockable as they use internal types we can't recreate in our tests.
See https://github.com/cloudquery/cloudquery/blob/876cc163d6dff277bb09a5147162a8646fcd98de/plugins/source/gcp/codegen/recipes/aiplatform.go#L21

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For some plugins it's useful to configure a resolver based on the field's type:
https://github.com/cloudquery/cloudquery/blob/876cc163d6dff277bb09a5147162a8646fcd98de/plugins/source/gcp/codegen/main.go#L263

I don't use the default one from `codegen` package like others as it returns `(string, error)` and we want to return a `schema.ColumnResolver` instead

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This makes sure every CQType implements size so we can report to the users also how many bytes/MB were synced in addition to number of resources/rows.

This will also be useful in our analytics.

🤖 I have created a release *beep* *boop*
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## [1.22.0](v1.21.0...v1.22.0) (2023-01-06)


### Features

* Add size in bytes to CQ types ([#510](#510)) ([7c15d9a](7c15d9a))
* Add WithIgnoreInTestsTransformer ([#579](#579)) ([f836abd](f836abd))
* Add WithResolverTransformer ([#578](#578)) ([5aeba0e](5aeba0e))

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