Merge third-party changes from tpg PR 2290

[nat-henderson]

Adds SQL SSL Cert resource (handwritten) to Terraform.

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[all]

[terraform]

Close this PR - merge #2290 instead

[terraform-beta]

Add the sql ssl (client) cert resource, sibling of TPG #2290.

[ansible]

[inspec]

[googlebot]

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[nat-henderson]

This code is in a third party directory not subject to Google's CLA rules.

[modular-magician]

I am a robot that works on MagicModules PRs!

I built this PR into one or more PRs on other repositories, and when those are closed, this PR will also be merged and closed.
depends: hashicorp/terraform-provider-google-beta#134
depends: hashicorp/terraform-provider-google#2473