download using chunk iteration rather than raw response

[itcarroll]

Fixes #887

The internals for download now use the recommended (by requests) requests.Response.iter_content method to download granules while keeping memory usage capped at 1MB.

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📚 Documentation preview 📚: https://earthaccess--920.org.readthedocs.build/en/920/

[github-actions]

👈 Launch a binder notebook on this branch for commit 1515e3e

I will automatically update this comment whenever this PR is modified

👈 Launch a binder notebook on this branch for commit db0fa4e

[mfisher87]

LGTM!