[libc][NFC] Remove FloatProperties (#76508)

Access is now done through `FPBits` exclusively.
This patch also renames a few internal structs and uses `T` instead of
`FP` as a template parameter.

libc/fuzzing/stdlib/strtofloat_fuzz.cpp

@@ -22,18 +22,17 @@
 
 #include "utils/MPFRWrapper/mpfr_inc.h"
 
-using LIBC_NAMESPACE::fputil::FloatProperties;
+using LIBC_NAMESPACE::fputil::FPBits;
 
 // This function calculates the effective precision for a given float type and
 // exponent. Subnormals have a lower effective precision since they don't
 // necessarily use all of the bits of the mantissa.
 template <typename F> inline constexpr int effective_precision(int exponent) {
-  const int full_precision = FloatProperties<F>::MANTISSA_PRECISION;
+  const int full_precision = FPBits<F>::MANTISSA_PRECISION;
 
   // This is intended to be 0 when the exponent is the lowest normal and
   // increase as the exponent's magnitude increases.
-  const int bits_below_normal =
-      (-exponent) - (FloatProperties<F>::EXP_BIAS - 1);
+  const int bits_below_normal = (-exponent) - (FPBits<F>::EXP_BIAS - 1);
 
   // The precision should be the normal, full precision, minus the bits lost
   // by this being a subnormal, minus one for the implicit leading one.