socket_write() and send() return the number of bytes sent
add some of the constants used by httpserver (others missing)
dummy entries for setsockopt(), listen() and setblocking()
implement bind() by using ninafw start_server()
implement accept() by getting a clien socket from that server

add back socknum parameter to allow wrapping a Socket around a ninafw socket number, which is required to be able to receive a connection from the server

re-implement timeout similar to Circuitpython (None blocks, 0 doesn't)
NOTE: this is a breaking change for any code that uses it

bind() saves the bound address and port
listen() uses the saved address and port or uses defaults
some fixes for pylint/black

Co-authored-by: Dan Halbert <halbert@halwitz.org>

Bring more compatibility with native sockets