Use proptest for deserialisation and serialisation tests

[xgreenx]

In the codebase, we have many places where we try to generate different types of transactions with different inputs and see that we can serialize/deserialize them properly.

Instead of doing that manually we can use the proptest framework to generate transactions.

#707 (comment)
#707 (comment)
#707 (comment)
#707 (comment)

We have this problem for each type of transaction, so it should be a huge refactoring of all tests related to serialization and deserialization.