* pallet-message-queue: add queue pausing

Signed-off-by: Oliver Tale-Yazdi <[email protected]>

* Fix build

Signed-off-by: Oliver Tale-Yazdi <[email protected]>

* Remove check

Otherwise it would not start servicing queues that started paused
and became unpaused afterwards.

Signed-off-by: Oliver Tale-Yazdi <[email protected]>

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Signed-off-by: Oliver Tale-Yazdi <[email protected]>