Replaced raw arrays with std::array in IPv4 and IPv6 address classes.

Overview of changes:

• Replaced raw array usages with std::array in internal implementation of IPv4Address and IPv6Address.

Overview of new additions:

• Added new constructors to IPv4Address and IPv6Address that take std::array<uint8_t, 4> and std::array<uint8_t, 16> respectively.
• Added new getter method toByteArray() to to IPv4Address and IPv6Address that return std::array<uint8_t, 4> and std::array<uint8_t, 16> respectively.