Integers 128-bit support

[kassane]

Ref: tigerbeetle/tigerbeetle#1157

• boost::multiprecision;
• std::bitset<N>;
• Bitset2::bitset2 header-only;
• absl::uint128/absl::int128;
• __int128/unsigned __int128: GCC & Clang

[kassane]

std::decimal ISO C++ proposal project.
BDE bin2dec