Bridge can split messages

[konnorandrews]

Bug report

The Bridges can fail to read a message if it lands on a buffer boundary.

[0|message name|]...[3|data|test|message|] -> [0, message name, undefined/0]

Context

utils/cpp/comm and utils/javascript/comm

Process

1. Use a Hub to send a large message
2. Receive the message with a very low buffer size on the Port
3. The Stream will correctly wait for entire strings to be completed
4. The Bridge will only read part of the message, and error on the rest

Expected result

The Bridge should wait for the entire message to be received.

Current result

The Bridge will only read part of a message if it lands on a buffer boundary.