TPU utilization logging [WIP]

[coveralls]

Pull Request Test Coverage Report for Build 67ac9156-71ec-4dc8-bb08-dd5f6a532478

• 16 of 66 (24.24%) changed or added relevant lines in 2 files are covered.
• 110 unchanged lines in 25 files lost coverage.
• Overall coverage increased (+3.7%) to 65.243%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
wandb/internal/stats.py	1	11	9.09%
wandb/internal/tpu.py	15	55	27.27%
<!--	Total:	16	66	24.24%	-->

Files with Coverage Reduction	New Missed Lines	%
wandb/apis/internal_runqueue.py	1	22.42%
wandb/filesync/dir_watcher.py	1	81.62%
wandb/internal/internal_api.py	1	61.36%
wandb/internal/meta.py	1	70.8%
wandb/internal/run.py	1	61.54%
wandb/internal/stats.py	1	14.18%
wandb/lib/ipython.py	1	80.0%
wandb/util.py	1	64.75%
tests/test_datastore.py	2	97.83%
tests/test_util.py	2	97.44%
<!--	Total:	110		-->

Totals
Change from base Build 789ef72f-b1a9-460c-8c97-3af7c02bd63f:	3.7%
Covered Lines:	13977
Relevant Lines:	21423

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💛 - Coveralls

[vanpelt]

We should also look for the GCP zone and project environment variables. The ones I'm aware of:

CLOUDSDK_CORE_PROJECT CLOUDSDK_CORE_ZONE PROJECT_ID

The error message here explains to set tpu_zone, tpu_project but the user can't actually do that because they aren't instantiating the profiler. We should also give users a way to specify this via env or settings.