examples: use APIs from aws-iot-expresslink library in examples

[sanketwadekar]

• Update examples with new aws-iot-expresslink APIs
• Add a new example that removes the state machine used in previous example.
  cc: @dhavalgujar

[Kriechi]

Are you referring to https://github.com/awslabs/aws-iot-expresslink-library-arduino ?
Please add a mention to either the code or a README file on where to find this dependency.