transport_ws can now be read multiple times in a row to read frames larger than the buffer.
Added reporting of total payload length and offset to the user in websocket_client.
Added local example test for long messages.
Closes IDF-1083
* Original commit: espressif/esp-idf@ffeda3003c
- Added a example test that connects to a local python websocket server.
- Added readme for websocket_client example.
Closes IDF-907
* Original commit: espressif/esp-idf@67c5225c14