Enabling polls feature

[yostyle]

Type of change

• [x] Feature
• [ ] Bugfix
• [ ] Technical
• [ ] Other :

Content

Enable polls

Motivation and context

Screenshots / GIFs

Tests

• Step 1
• Step 2
• Step ...

Tested devices

• [ ] Physical
• [ ] Emulator
• OS version(s):

Checklist

• [ ] Changes has been tested on an Android device or Android emulator with API 21
• [ ] UI change has been tested on both light and dark themes
• [ ] Accessibility has been taken into account. See https://github.com/tchapgouv/tchap-android-v2/blob/develop/CONTRIBUTING.md#accessibility
• [x] Pull request is based on the develop branch
• [ ] Pull request updates TCHAP_CHANGES.md
• [ ] Pull request includes a new file under ./changelog.d. See https://github.com/tchapgouv/tchap-android-v2/blob/develop/CONTRIBUTING.md#changelog
• [ ] Pull request includes screenshots or videos if containing UI changes
• [ ] Pull request includes a sign off
• [ ] You've made a self review of your PR
• [ ] If you have modified the screen flow, or added new screens to the application, you have updated the test UiAllScreensSanityTest.allScreensTest()

[tchap-danger-bot[bot]]

	Warnings
:warning:	Please add a changelog. See instructions [here](https://github.com/vector-im/element-android/blob/develop/CONTRIBUTING.md#changelog)
:warning:	You seem to have made changes to views. Please consider adding screenshots.

Generated by :no_entry_sign: dangerJS against e5383997674eb8a00f8f5f9607ec34df105b1c58

[tchap-danger-bot[bot]]

	Warnings
:warning:	Please add a changelog. See instructions [here](https://github.com/vector-im/element-android/blob/develop/CONTRIBUTING.md#changelog)
:warning:	You seem to have made changes to views. Please consider adding screenshots.

Generated by :no_entry_sign: dangerJS against 54d7e7cf348a859466bf4610fac48df8b1fe5621

[tchap-danger-bot[bot]]

	Warnings
:warning:	You seem to have made changes to views. Please consider adding screenshots.

Generated by :no_entry_sign: dangerJS against dea2dfd07a2362e10f7c4969affdfb522cabe233

[tchap-danger-bot[bot]]

	Warnings
:warning:	You seem to have made changes to views. Please consider adding screenshots.

Generated by :no_entry_sign: dangerJS against e4ed15cac86554ff6451e63aa076412f94b2141d