feat(iam): add list user grace periods method

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 71.00%. Comparing base (5bf53e0) to head (2f3bb31). Report is 351 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4287 +/- ## ========================================== - Coverage 75.45% 71.00% -4.46% ========================================== Files 202 294 +92 Lines 44323 66036 +21713 ========================================== + Hits 33444 46887 +13443 - Misses 9653 17509 +7856 - Partials 1226 1640 +414 ```

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