use rust implementation of SerializedProgram

[arvidn]

Purpose:

This replaces the SerializedProgram class with the counterpart from chia_rs. The long-term objective is to make FullBlock able to live entirely in rust, to move validation to threads. The transactions_generator field is a serialized CLVM program.

The main challenge in the python binding for this class, is how python arguments are converted into CLVM structures before invoking the program (e.g. run_with_cost()). This conversion is partly implemented in _serialize(), here as well as SExp.to, in the clvm wheel.

Note how there's a special case when passing a SerializedProgram, its bytes are used directly. i.e. a serialized program is passed as the CLVM structure it represents, not as a blob of bytes (i.e. a single atom). This special handling no longer exists when entering the SExp.to() path.

The rust implementation of this behavior can be found here (the _serialize() counterpart) and here (the SExp.to() counterpart).

Current Behavior:

SerializedProgram is implemented in python (but CLVM is run by rust)

New Behavior:

SerializedProgram is implemented in rust

[coveralls-official]

Pull Request Test Coverage Report for Build 7554530142

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.01%) to 90.58%

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Totals
Change from base Build 7549452453:	-0.01%
Covered Lines:	94735
Relevant Lines:	104543

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💛 - Coveralls

[Rigidity]

Love to see it