[Story] Indicate pending messages in the room list

[mxandreas]

Description

• As a user
• I want to see if a message is pending (being still sent) in the room list
• So that I would be aware of that even if I am not no longer in that room.

This applies whenever there is at least one message that we're still trying to send. A clock icon appears next to the room name.

The design file.

Acceptance criteria

• TBD

Dependencies

• None

Out of scope

• Nothing

Questions

• [ ]

Subtasks

Android

iOS

Rust

Other

[bmarty]

Android impl is here: element-hq/element-x-android#5824

[pixlwave]

Done on iOS in element-hq/element-x-ios#4791

[manuroe]

Thanks @bmarty and @pixlwave !The UX is now plugged. Issues that are likely to be related to SDK logic are listed in the Q&A section of the epic.