Add sendkeys method in T2C runner and support input keys directly

[TedaLIEz]

T2C runner would support input keys directly to the current focused element, input example:

{
  "index": 18,
  "elementInfo": { },
  "driverId": "99101FFBA00B1P",
  "action": {
    "actionType": "input",
    "arguments": {
      "content": "helloworld"
    }
  },
  "isOption": false
}

[zhou9584]

Could you add an action sample to the taps_to_cases/T2C_Runner/src/test/resources/DemoJson.json and run taps_to_cases/T2C_Runner/src/test/java/SampleT2CTest.java in your local machine?