[native] display connnection state of keyserver

Summary:
This diff adds the connection indicator of the keyservers in the keyserver selection list. For context here are the designs

Linear task: https://linear.app/comm/issue/ENG-5369/show-connection-state-of-the-keyserver

Depends on D9642

Test Plan:
Please see the screenshots below (the second keyserver is just a test "dummy" keyserver I added to the keyserver store when testing the add keyserver flow)

Reviewers: inka, rohan, michal

Reviewed By: rohan

Subscribers: ashoat, tomek, ted, wyilio

Differential Revision: https://phab.comm.dev/D9643