Room retention event implementation

Codecov Report

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

Project coverage is 55.67%. Comparing base (cf3dcca) to head (ddd97be). Report is 43 commits behind head on develop.

:exclamation: Current head ddd97be differs from pull request most recent head 05f5519

Please upload reports for the commit 05f5519 to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #7809 +/- ## ============================================ + Coverage 12.33% 55.67% +43.33% ============================================ Files 1651 449 -1202 Lines 163960 18917 -145043 Branches 67314 7964 -59350 ============================================ - Hits 20232 10532 -9700 + Misses 143091 8156 -134935 + Partials 637 229 -408 ``` | [Flag](https://app.codecov.io/gh/element-hq/element-ios/pull/7809/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=element-hq) | Coverage Δ | | |---|---|---| | [uitests](https://app.codecov.io/gh/element-hq/element-ios/pull/7809/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=element-hq) | `55.67% <ø> (+0.02%)` | :arrow_up: | | [unittests](https://app.codecov.io/gh/element-hq/element-ios/pull/7809/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=element-hq) | `?` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=element-hq#carryforward-flags-in-the-pull-request-comment) to find out more.

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element-hq / element-ios

Room retention event implementation #7809

Codecov Report

Quality Gate passed