[ML][single] Fix SingleShot.input attribute change

[ML][single] Fix SingleShot.input attribute change

Changing input attribute should enable invoking model with different tensor.
User should not be able to modify or dispose input by direct call.
Change is only possible by replacing whole object.

Code:

var ti1 = new tizen.ml.TensorsInfo()
ti1.addTensorInfo("three", "FLOAT32", [1, 1, 1, 1])
var td1 = ti1.getTensorsData(0);
var ti3 = new tizen.ml.TensorsInfo()
ti3.addTensorInfo("three", "FLOAT32", [3, 1, 1, 1])
var td3 = ti3.getTensorsData(0);

var model = tizen.ml.single.openModel("documents/add.tflite", null, null, "ANY", "ANY", false)
model.invoke(td1)
model.input = ti3
model.invoke(td3)

[Verification] Tested in Google Chrome console

Change-Id: Iac17fd72d7e417d30bad983f6c349bd5e5ef05ed
Signed-off-by: Rafal Walczyna <r.walczyna@samsung.com>