feat: tpu_vm_create/get/list/delete/stop/start

[gryczj]

Description

Fixes #<ISSUE-NUMBER>

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Checklist

• [x] I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• [x] Tests pass: npm test (see Testing)
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• [ ] These samples need a new API enabled in testing projects to pass (let us know which ones)
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[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 6 region tags.

• tpu/createVM.js:20, tag tpu_vm_create
• tpu/deleteVM.js:20, tag tpu_vm_delete
• tpu/getVM.js:20, tag tpu_vm_get
• tpu/getVMList.js:20, tag tpu_vm_list
• tpu/startVM.js:20, tag tpu_vm_start
• tpu/stopVM.js:20, tag tpu_vm_stop

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[m-strzelczyk]

One important note: The TPUs are a product separate from Compute (that's more politics than technical separation), but they should have their own folder. So please extract the TPU related code from the compute folder and make a new tpu folder in the root of the repo. (You'll also need to edit CODEOWNERS file (copy the configuration for compute)).

Now, as for the fate of this PR - I'm trying to get in touch with the team responsible for the TPU product and their library. Hopefully, there will be some updates to the library, maybe solving the networking issue. That's why for now, I put a do not merge label on this PR - let's wait and see what the team has to say. If they won't have any good news for us with reasonable timing, we'll merge this.

[gryczj]

Due to high costs of TPU Nodes, it was decided to use mocks in the tests.