Keith Yeung ae3c3045df Implement iter_keys function for all types of storage maps (#9238)
* Implement `iter_keys` function for all types of storage maps

* Remove draining iterator API

* Rename associated key iterator types

* Simplify iteration code

* add test for `iter_keys().drain()`

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
2021-07-01 17:20:15 +00:00
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