Uartevent (#393)

* support for uart data event

* updated shims

docs/reference/bluetooth/on-uart-data-received.md

@@ -0,0 +1,21 @@
+# Bluetooth On UART Data Received
+
+Registers an event to be fired when one of the delimiter is matched.
+
+```sig
+bluetooth.onUartDataReceived(",", () => {})
+```
+
+### Parameters
+
+* `delimiters` is a [string](/types/string) containing any of the character to match
+
+### Example
+
+Read values separated by `,`:
+
+```blocks
+bluetooth.onUartDataReceived(serial.delimiters(Delimiters.Comma), () => {
+    basic.showString(serial.readUntil(serial.delimiters(Delimiters.Comma)))
+})
+```