When a bridge is stopped it doesn't wait for pending send
acknowledgements to arrive. However, when a bridge is paused it does
wait. The behavior should be consistent and more importantly
configurable. This commit implements these improvements and generally
refactors BridgeImpl to clarify and simplify the code. In total, this
commit includes the follow changes:
- Removes the hard-coded 60-second timeout for pending acks when
pausing the bridge and adds a new config parameter (i.e.
"pending-ack-timeout").
- Applies the new pending-ack-timeout when the bridge is stopped.
- Updates existing and adds new logging messages for clarity.
- De-duplicates code for sending bridge-related notifications.
- Avoids converting bridge name to/from SimpleString.
- Removes unnecessary comments.
- Renames variables & functions for clarity.
- Replaces the `started`, `stopping`, & `active` booleans with a
single `state` variable which is an enum.
- Adds `final` to a few variables that were functionally final.
- Synchronizes `stop` & `pause` methods to add safety when invoked
concurrently with `handle` (since both deal with `state` and execute
runnables on the ordered executor).
- Reorganizes and removes a few methods for clarity.
- Relocates `connect` method directly into `ConnectRunnable` (mirroring
the structure of the `StopRunnable` and `PauseRunnable`).
- Eliminates unnecessary variables in `ConnectRunnable` and
`ScheduledConnectRunnable`.
- Adds test to verify pending ack timeout works as expected with both
`stop` & `pause` with both regular and large messages.
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