Add Collection API (#1687)
* Add Collection API
* add unit tests
* collections
* add guide (wip)
* completed guide
* fix collection tests
* uncomment
* document 500 limit
* delete
* tpyo
* better formatting
* docs
* fix test
* Apply suggestions from code review
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
* requested changes
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Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
