WIP: Add FirestoreDatabase direct controller

[jasonvigil]

Based on example in #2573

[google-oss-prow]

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[jingyih]

Hi @jasonvigil, are you seeing similar issues when generating the types as mentioned in #2573 (comment)?

[jasonvigil]

@jingyih

Hi @jasonvigil, are you seeing similar issues when generating the types as mentioned in #2573 (comment)?

I think so. There are quite a few extra resources (besides Database) generated in types.generated.go. Though I am not sure if that is intentional (?)

[jingyih]

I updated the implementation of type generator in #2573. Would like to see if that works better for your resource.

[jasonvigil]

Thank you @jingyih! Pulled in your changes. It no longer generates extra resources.