[EPIC] Release initial DCL-based resources using tpgtools

[rileykarson]

With the Declarative Resource Client Library (DCL) becoming available, we can begin using the tpgtools generator to create Terraform resources. DCL+tpgtools collectively make up Magic Modules v2, the successor to the current "MMv1" generator at https://github.com/GoogleCloudPlatform/magic-modules. Working off of the already-declarative DCL, tpgtools is a much more lightweight code generator that we anticipate will have a much lower ongoing maintenance cost and lower latency before new resources and fields become available.

We've got a massive bank of resources in MMv1 already and we don't anticipate removing it entirely anytime soon. As a result we'll be running the tpgtools and MMv1 generators side-by-side in the https://github.com/GoogleCloudPlatform/magic-modules repo.

This issue tracks the introduction of tpgtools as a whole. Below are some of the sub-issues we've filed (so far!):

• Move Magic Modules version 1 (MMv1) into a subfolder within the magic-modules repo #8198
• Put a build system in front of MMv1, tpgtools #8199
• Add support for samples in tpgtools #8200
• Opt-in resources to tpgtools generation using override files #8201
• Plumb TPG basepaths into the DCL #8202
• Ensure that user project overrides are supported in DCL-based resources #8203
• Support module attribution in DCL-based resources #8204
• Add support for Eventarc #8069
• Convert 3-5 handwritten/MMv1-generated resources to using the DCL #8205
• Ensure the tpgtools schema diff tool works externally #8207
• Run mixed integration tests with a release TPG copy and a copy with DCL-based resources #8208

[rileykarson]

We did this one a while ago. We're up to 20+!

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