Import stacks-codec from stackslib

[hugocaillard]

Clarinet exports its own copy of the stacks-codec.
The codec is used to encode/decode the stacks wire format

It's mostly code copy-pasted for stacks-core/stackslib. I think it was copy pasted because the codec in stacks lib can not be imported out of the box.

But now it makes it complicated and error prone to maintain and update the codec in clarinet (eg: this PR #1524). We should consider imported the code from stacks-core