chore: add fast-float for fast floating-point parsing

[Zeno-sole]

Add fast-float package for fast and accurate floating-point number parsing.

fast-float is a C++ library providing:

• Fast implementation of C++17 from_chars for float and double
• Parsing speeds several times faster than standard library implementations
• Correct rounding as per IEEE 754 standard
• Header-only library, easy to integrate

This package is needed for applications requiring high-performance numerical parsing.

Upstream: https://github.com/fastfloat/fast_float

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