Move BinaryTableValue to public section

[BenBorn]

#879

Proposed Changes

Move the BinaryTableValue class to the public section, because its returned by:
'result.BasicProperties.Headers.TryGetValue("key", out object value);'

Types of Changes

What types of changes does your code introduce to this project?
Put an x in the boxes that apply

• [x ] Bug fix (non-breaking change which fixes issue #NNNN)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause an observable behavior change in existing systems)
• Documentation improvements (corrections, new content, etc)
• Cosmetic change (whitespace, formatting, etc)

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[michaelklishin]

RabbitMQ.Client.client.api is not a namespace used by this client. I don't see any updates to API approval tests either. This needs more work.

[lukebakken]

@michaelklishin I'll wrap this one up this morning.

[lukebakken]

@BenBorn thanks!