redis

Fixes #8825 

We're using the fast_float library[1] in our (compiled-in)
floating-point fast_float_strtod implementation for faster and more
portable parsing of 64 decimal strings.

The single file fast_float.h is an amalgamation of the entire library,
which can be (re)generated with the amalgamate.py script (from the
fast_float repository) via the command:

```
python3 ./script/amalgamate.py --license=MIT > $REDIS_SRC/deps/fast_float/fast_float.h
```

[1]: https://github.com/fastfloat/fast_float

The used commit from fast_float library was the one from
https://github.com/fastfloat/fast_float/releases/tag/v3.10.1



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Co-authored-by: fcostaoliveira <filipe@redis.com>