add flag to disable raising exceptions with pipelined

[philippeboyd]

Linked to redis-rb/redis-client#187
Depends on redis-rb/redis-cluster-client#343

Modifying the pipelined method in lib/redis_client.rb to include an optional exception parameter, which determines whether an exception should be raised when an error occurs during pipelining.

This gives better flexibility for error management when we want to retry only failed commands.

[supercaracal]

Several errors and failures in test cases of the cluster feature will be fixed with the following PR.

• Fix the watch command bugs for the cluster client #1255

Although there are some discussion about the transaction feature for the cluster client, the issue is a matter on the redis-cluster-client side. So redis-rb can ignore the discussion at now.