Finish implement search bar at the top of the rooms list (#123)

[tyreseluo]

The search function is mostly complete with some expansion reserved . rooms_sidebar will create three actions in preparation for the people and channel filtering features that follow. now, we only capture the RoomsSideBarFilter::Rooms action.

[tyreseluo]

Hi! @joulei Thanks for your comments and reviewed . I learned a lot and I will revise the code and present it again for review.

[kevinaboos]

thanks for the review, I generally agree with @joulei's comments. @tyreseluo let me know when you're ready for another review.