Requests with CPython Native Socket

[brentru]

The CircuitPython_Requests module is currently untested with CPython's socket low-level interface.

A new requests_simpletest example would need to be added, too.

• https://github.com/adafruit/Adafruit_CircuitPython_Requests/blob/master/examples/requests_simpletest.py

After updating for the CPython native socket, we may need to update ESP32, Ethernet and Cellular socket-like implementations for compatibility.

[tannewt]

Furthermore, it should always use the recv*_into forms for receive to minimize memory allocations. (The others create new byte arrays to return.)

[tannewt]

I'm working on this.