Refactor (and rename) Exchange#bindings to remove memory allocations #5016

Job	Run time
Lint check	1m 3s
Format check	14s
Lint javascript	15s
Lint OpenAPI	17s
Spec	2m 6s
Compile LavinMQ	57s
Spec FreeBSD	2m 33s
Filters for frontend specs	3s
Spec OS X	2m 28s
RabbitMQ HTTP API Go client test	0s
RabbitMQ java client test	0s
Bunny client test	0s
Test in release mode	0s
Frontend specs	0s
RabbitMQ HTTP API Ruby client test	0s
	9m 56s

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