Expose CSR Nonce to Android/iOS layer

[austinh0]

Problem

• Custom CSR nonce was supported in Support passing csr nonce into commissioning flow #7696, but there's no Android or iOS API to pass in that value

Change overview

• Add csrNonce parameter in CHIPDeviceController.mm#pairDevice() and ChipDeviceController.java#pairDevice().

Testing

• On Android and iOS, called PairDevice with an empty 32-byte CSR nonce and verified that commissioning completes successfully.

[todo]

(#7985): Annotate csrNonce as Nullable.

connectedhomeip/src/controller/java/src/chip/devicecontroller/ChipDeviceController.java

Lines 56 to 65 in b73703d

	* <p>TODO(#7985): Annotate csrNonce as Nullable.
	*
	* @param csrNonce the 32-byte CSR nonce to use, or null if we want to use an internally randomly
	* generated CSR nonce.
	*/
	public void pairDevice(
	BluetoothGatt bleServer, long deviceId, long setupPincode, byte[] csrNonce) {
	if (connectionId == 0) {
	bleGatt = bleServer;

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This comment was generated by todo based on a TODO comment in b73703d in #7987. cc @austinh0.

[bzbarsky-apple]

Why does this assignment need to be here?

[austinh0]

It doesn't, I missed this. Will clean this up next time I touch this file...