Deduplication, support select_streams on single pass, support headers-only#74

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cboulay wants to merge 5 commits intomainfrom

Commits on Dec 29, 2020

deduplication step 1 - build out `_read_chunks` to read all data but retain stream-headers-only for resolve_streams.
cboulay
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deduplication step 2:
cboulay
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Commits on Dec 30, 2020

Commits on Apr 1, 2021

Revert parse_chunks renaming
cbrnr
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