refactor: Add consteval uint256(hex_str)

Complements uint256::FromHex() nicely in that it naturally does all error checking at compile time and so doesn't need to return an std::optional.

Will be used in the following 2 commits to replace many calls to uint256S(). uint256S() calls taking C-string literals are littered throughout the codebase and executed at runtime to perform parsing unless a given optimizer was surprisingly efficient. While this may not be a hot spot, it's better hygiene in C++20 to store the parsed data blob directly in the binary, without any parsing at runtime.

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