chaining get

[giraffekey]

The current implementation of get does not support chained get calls such as gun.get("key").get("prop").put("val").

The GunGet struct should have its own get function that returns a new Self. Not sure how we'd implement chaining but I'm guessing the key field of GunGet would need to be changed to a vector of strings rather than a str. Then on, once and put would somehow need to be changed to support chaining. Not sure what the get and put requests would look like in a chained context.

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[giraffekey]

Also gun.back() should be implemented.