Amplifying rust number types

Crates adding more number types to rust: big numbers (from u512 to u4094), small-bit numbers (u2 to u7), custom bit-sized numbers (like u24) and a full range of IEEE-compatible float types.

This is a part of Rust language amplification library amplify.

Minimum supported rust compiler version (MSRV): 1.60.0. Rust edition 2021.