- Fixed `socket_available` to just report and not flush available UDP
  data when calling multiple times.
- Fixed socket `__exit__` to only disconnect if a TCP (stream) socket.
- Connect can now accept domain names like CPython versus only IP
  addresses.
- Added socket `send_to`, `recvfrom`, `recv_into`, `recvfrom_into`
  methods for better compatibility with CPython socket.
- Simplified `recv` and `readline` socket methods due to
  `available` doing the right thing for both TCP and UDP.
- Reformatting to make black happy.
- Changes made and tested to make generic socket NTP implementation work:
  https://github.com/askpatrickw/Adafruit_CircuitPython_NTP/blob/raw_ntp/adafruit_ntp.py

Socket improvements