Propagate real exceptions

[dmitryuk]

The pr adds real exceptions to target method AbstractConnection::channel.

Developer will can understand transparently that method channel can throw AMQPTimeoutException,AMQPConnectionClosedException and do reconnect

[codecov]

Codecov Report

Merging #976 (2cbd008) into master (97175f5) will decrease coverage by 0.18%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #976      +/-   ##
============================================
- Coverage     72.58%   72.40%   -0.19%     
- Complexity      887      900      +13     
============================================
  Files            31       33       +2     
  Lines          2488     2522      +34     
============================================
+ Hits           1806     1826      +20     
- Misses          682      696      +14     

Impacted Files	Coverage Δ
PhpAmqpLib/Channel/AMQPChannel.php	53.22% <ø> (ø)
PhpAmqpLib/Channel/AbstractChannel.php	70.05% <ø> (ø)
PhpAmqpLib/Connection/AbstractConnection.php	74.61% <ø> (-0.51%)	⬇️
PhpAmqpLib/Wire/IO/AbstractIO.php	81.96% <0.00%> (-13.12%)	⬇️
...mqpLib/Connection/Heartbeat/SIGHeartbeatSender.php	90.62% <0.00%> (ø)
...ection/Heartbeat/AbstractSignalHeartbeatSender.php	75.00% <0.00%> (ø)
...pLib/Connection/Heartbeat/PCNTLHeartbeatSender.php	100.00% <0.00%> (+10.52%)	⬆️

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