[python] Progress bar for download_source_h5ad

[ivirshup]

For #1033

Adding a progress bar for download_source_h5ad

TODO:

• [x] Tests?
• [x] Do we want a way to turn this off?
• [x] Does this display correctly in a notebook?
  • I does a text based progress bar in a vscode notebook. There is an HTML one, but the main difference is that the html one is blue.

Currently looks like:

In [3]: cellxgene_census.download_source_h5ad(small_dataset.dataset_id, "tmp.h5ad")
Downloading: 100%|████████████████████████████████████████████████████████████████████████████████████████████████████████| 5.10M/5.10M [00:00<00:00, 17.7MB/s]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 94.44444% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 91.12%. Comparing base (e36addb) to head (8cec54c). Report is 11 commits behind head on main.

Files	Patch %	Lines
api/python/cellxgene_census/tests/test_open.py	91.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1153 +/- ## ========================================== - Coverage 91.12% 91.12% -0.01% ========================================== Files 77 77 Lines 5857 5902 +45 ========================================== + Hits 5337 5378 +41 - Misses 520 524 +4 ``` | [Flag](https://app.codecov.io/gh/chanzuckerberg/cellxgene-census/pull/1153/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=chanzuckerberg) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/chanzuckerberg/cellxgene-census/pull/1153/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=chanzuckerberg) | `91.12% <94.44%> (-0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=chanzuckerberg#carryforward-flags-in-the-pull-request-comment) to find out more.

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