Returns the floating point number represented by the four bytes at
byteOffset in this object, in IEEE 754
single-precision binary floating-point format (binary32).
Throws RangeError if
byteOffset is negative, or
byteOffset + 4 is greater than the length of this object.
double getFloat32(int byteOffset, [Endianness endian = Endianness.BIG_ENDIAN]);