feat(*): refactor Go SDK to be more intuitive

[Nickersoft]

This PR introduces a major change to the Go SDK to make building dictionaries declaratively more intuitive. A number of renames have taken place, notably:

• Representable types are now just the default types. So DictionaryRepresentable is now just Dictionary.
• To distinguish from the Go structs, all FlatBuffer objects now have a Buffer prefix. So the old Dictionary type, which used to be a FlatBuffer, is now called DictionaryBuffer.
• Renamed AsRepresentable() to Struct()
• Renamed AsBuffer to Buffer() and updated it to return an actual FlatBuffer
• Added Table() method that returns what the old AsBuffer() method used to – a FlatBuffers table offset
• Added Bytes() method that returns a byte array
• Changed the names of all of the Compile and Write methods. Any Compile method will accept a path/XML/dictionary/etc and give you a fully qualified ODict byte buffer back, whereas Write does the same thing, except it writes the buffer to the specified output path and gives you the bytes written

The docs site will need to be updated.

[Nickersoft]

Closing in favor of #639