Extract serialization in it's own pod

[MP0w]

Serialization provided by Kakapo is quite powerful (IMHO 😀) and might be useful even without using Kakapo so we should:

• Extract serialization into a different pod
• Find a proper parrot name for the new parrot 🐥

[MP0w]

It's time to do it, there are also some possible feature needed like:

• Key mapping (replace keys, powered by KeyTransformer)
• "flatten" the serialized object
  cc/ @poolqf

Possible name: Cockatoo ?

[joanromano]

Fine, I guess there might be other possible features that we can't foresee right now.

Regarding the name, after some reading I've seen some nice names on the true parrots species list, but I am fine with Cockatoo as well.

[polqf]

An extension to serialize RawRepresentable elements would also be needed.

BTW, Cockatoo is cool

[MP0w]

What about a subspec instead #152 ?