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PythStruct trait that basically binds some constants to each type of Pyth account.
Now functions that interact with all 3 of Pyth accounts can use the trait.
I turned
load_mapping_account_mut
andload_mapping_product_mut
intoload_checked<T: PythStruct>
and equally
initialize_mapping_account
andinitialize_product_account
intoinitialize_checked<T:PythStruct>
In the future, these functions should also perform the other checks (signatures, rent, program ownership). But I'm doing it incrementally.