add USBLC6-4 4-channel TVS diode

diode/diode_tvs_st_usblc6-4.yaml

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+name: USBLC6-4
+variations: SC6
+description: ESD protection, 4 data-line
+datasheet: https://www.st.com/resource/en/datasheet/usblc6-4.pdf
+
+pinout:
+  IO:
+    IO1: 1
+    IO2: 3
+    IO3: 4
+    IO4: 6
+  GND: 2
+  VBUS: 5
+
+properties:
+  passive: IO
+  power: VBUS
+  ground: GND
+
+schematic:
+  symbol: diode # the device is a quad-diode, but this is the closest we have
+  options: TVS
+  left: IO
+  top: VBUS
+  bottom: GND
+
+housing@SC6:
+  suffix: 6L
+  pattern: SOT23
+  leadCount: 6
+  bodyWidth: 1.50-1.75 # E
+  bodyLength: 2.80-3.05 # D
+  height: 0.90-1.45 # A
+  pitch: 0.95 # e
+  leadWidth: 0.35-0.50 # b
+  leadLength: 0.10-0.60 # L
+  leadHeight: 0.0-0.1 # A1
+  leadSpan: 2.6-3.0 # H