Reading an unreasonably large payloadSize should throw an exception.

[lukebakken]

See the following FIXME:

rabbitmq-dotnet-client/projects/RabbitMQ.Client/client/impl/Frame.cs

Line 280 in d82e383

int payloadSize = NetworkOrderDeserializer.ReadInt32(frameHeaderSpan.Slice(2, 4)); // FIXME - throw exn on unreasonable value

The default for this value will be the default max message size for RabbitMQ, 128MiB:

https://github.com/rabbitmq/rabbitmq-server/blob/46c400afcae92bf74ce52d3ff3b53f9836297047/deps/rabbit/Makefile#L118-L119

...and it will be configurable.

Related to #1213