Port/reimplemnt Payload along with `yapapi.payload.vm` and other `yapapi.payload` artifacts in golem-core:

[lucekdudek]

• refactor golem-core's Package.from_image_hash so it doesn't spin asyncio event loop
• refactor yappai's Package.resolve_url() so it returns plain url instead of str decorated with prefix and sufix

Examples

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1. Decite how Payload should look like #87
   +0

[approxit]

Question from initial state of this issue:

Q: what is the reason AutodecoratingModel exists?
A: It's used in declarative way to describe stuff payload/model payment strategy

Q: is there a reason to mix properties and constrains as a collection on the same level (instead of having two separated collections)?
A: It's handy just to throw your needs in one place, where specific mapping to props and constraints are handled automagically