PROTON-1442: [Cpp] Support for local transactions

[DreamPearl]

PROTON-1442

AMQP Transaction Sequence:

1. Declare transaction:

• Client establishes link to Broker (Transaction resource) to target with transaction coordinator type (usual types are sender/receiver) (ATTACH frame)

• Client (Transaction Controller) sends a special message to that link to create transaction (TRANSFER frame)

• Broker returns a disposition with the transaction id (DISPOSITION frame)

2. Send Message in the transaction:

• Client sends a message to the broker with transaction id in the state field.

3. Commit/Abort