Add support for the JSON Batch format

[mauroservienti]

Describe the feature.

Describe the requested feature

CloudEvents define a batching format called JSON Batch. It is essentially an array of CloudEvents. Each event in the array has its own headers/properties and can use different JSON formats.

Note

NServiceBus supports bundling multiple logical messages into a single physical message; the assumption is that all messages share the same headers and are of the same type. That prevents the CloudEvents package from leveraging that functionality to support JSON Batch.

Additional Context

No response