Add safe u256 add and sub #87
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This PR introduces some bases for the safe u256 type:
frommethods to create a safe u256 from signed and unsigned numbers, byte arrays...addmethod to add two safe u256 numberssubmethod to subtract two safe u256 numbersThis PR also includes tests for the new methods.
I tried to follow the existing code style and conventions, but please let me know if I missed something.