[pythnet] Add pyth from PythNet and locate with other PythNet modules.

[Reisen]

This PR brings the pyth submodule from PythNet into the crosschain repository under the name pythnet_sdk such that the validator can use it as a dependency instead. The code is identical so no changes have been introduced so the PR should be straight forward in concept even if it appears large. It also moves the message_buffer program into the same directory, the benefit of this is a Cargo.lock can be introduced under pythnet/ that will allow locking the dependencies of both to the same versions which will be useful when introducing message buffer types into the SDK.

The goal here is to make the pyth module a general PythNet SDK module that PythNet itself can also depend on.

[vercel]

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[jayantk]

nice