Add basic tile generation timing for titiler-cmr

[maxrjones]

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This PR includes the first steps towards resolving #49

• Create CMRTileTest in 02-run-tests/cmr_tile_test.py with analoguous functionality to CogTileTest and XarrayTileTest, which connects to CMR, generates arguments for creating a random tile, and runs the tile generation
• Add a notebook testing the approach on GPM IMERG

It seems like the in-memory caching is having a large impact on the results. The next steps are to configure the tests to run with and without the in-memory caching. I would prefer do that as a separate PR. After that, we can upload the results to S3.

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• Alternatively delete and start empty

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[abarciauskas-bgse]

@maxrjones LGTM, will be great to see how you disable in-memory caching 👀