[lib] Add hook for secondary device logout

Summary:

• Modified useLogOut() hook to be able to choose which identityClient method we want to call. Defaults to previous behavior
• Added useSecondaryDeviceLogOut() hook which calls the previous one with the proper method. In future diffs, it will be updated to notify primary device

Depends on D12122

Test Plan:

• Made sure that identity logout still works as before and keyserver logout is triggered.
• Made sure that setting logOutType: 'secondary_device' actually calls the other Identity RPC

Reviewers: kamil, varun, ashoat

Reviewed By: ashoat

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D12221