* Implement feature flag support

* cleanup

* update parsing and logging

* fix casing and async method prefix conventions

* Additional convention and changelist update

* Add additional common query params

* Addressing comments & adding support for user defined threadpool

* Renaming query params for consistency

* Add polling stop functionality, refactor api slightly, and increase code coverage

* fix exception type

* Fix tests when run under pypy

* Fix race in tests by completing executor tasks before assertion

* onboard to CodeCov

* remove name override for coverage file

* use updated codecov secret and snippet

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Co-authored-by: Kwame Efah <kwameefah@h7d9gc72q4-kwameefah.corp.mixpanel.com>