update cloud tutorial to work with publicly accessible cloud data

[JessicaS11]

The goal here was to get the data access notebook working in time for the Oct 2022 IS2 Science Team meeting. This PR updates granules to get the s3 urls directly from the CMR metadata rather than constructing them manually, and the CMR metadata are queried specifically for cloud data (which is identical to the on-premises data that you would download from NSIDC). It does not yet address simplifications to the authentication process (planned with the introduction of earthaccess, currently still packaged as earthdata).

NOTE: this PR will need to be merged after #331, at which point this branch should be selectively rebased to streamline the review).

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Codecov Report

Base: 57.51% // Head: 57.42% // Decreases project coverage by -0.09% :warning:

Coverage data is based on head (db717b2) compared to base (dfa21eb). Patch coverage: 72.72% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## development #381 +/- ## =============================================== - Coverage 57.51% 57.42% -0.10% =============================================== Files 31 29 -2 Lines 2248 2243 -5 Branches 431 433 +2 =============================================== - Hits 1293 1288 -5 + Misses 873 872 -1 - Partials 82 83 +1 ``` | [Impacted Files](https://codecov.io/gh/icesat2py/icepyx/pull/381?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=icesat2py) | Coverage Δ | | |---|---|---| | [icepyx/core/granules.py](https://codecov.io/gh/icesat2py/icepyx/pull/381/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=icesat2py#diff-aWNlcHl4L2NvcmUvZ3JhbnVsZXMucHk=) | `38.86% <62.50%> (+0.88%)` | :arrow_up: | | [icepyx/core/query.py](https://codecov.io/gh/icesat2py/icepyx/pull/381/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=icesat2py#diff-aWNlcHl4L2NvcmUvcXVlcnkucHk=) | `50.21% <100.00%> (ø)` | | | [icepyx/\_\_init\_\_.py](https://codecov.io/gh/icesat2py/icepyx/pull/381/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=icesat2py#diff-aWNlcHl4L19faW5pdF9fLnB5) | | | | [icepyx/conftest.py](https://codecov.io/gh/icesat2py/icepyx/pull/381/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=icesat2py#diff-aWNlcHl4L2NvbmZ0ZXN0LnB5) | | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=icesat2py). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=icesat2py)

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