Added WebSerialLite: a lightweight high-performance version of WebSerial #76

Job	Run time
arduino package_esp32_index.json	3m 10s
pio esp32dev\|arduino	1m 11s
arduino package_esp32_dev_index.json	2m 57s
pio esp32dev\|arduino-2	1m 18s
arduino package_esp8266com_index.json	1m 41s
pio esp32dev\|arduino-3	1m 49s
pio esp32-s3-devkitc-1\|arduino	1m 18s
pio esp32-s3-devkitc-1\|arduino-2	1m 24s
pio esp32-s3-devkitc-1\|arduino-3	1m 59s
pio huzzah\|espressif8266	1m 20s
	18m 7s

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