Tmp/socket keyboard refactoring

[georgik]

Temporal branch for refactoring of the solution. Discovered several issues:

• embedded-svc must be fixed to older version, because of SPI no longer works after update from v0.30 -> v0.37 esp-rs/esp-idf-hal#79
• when reference to WiFi goes out of scope, the WiFi is automatically disconnected
• tcp listener should be created inside new thread instead of passing from main thread to avoid problems with ownership