Add LightningLite Example

[tchaton]

What does this PR do?

This PR adds an example to use LightningLite with the BoringModel

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[rohitgr7]

nitpick: still reading

[hhsecond]

First thing that came to my mind when I saw LightningLite, was Tensorflow Lite. I thought the naming could have been better. But I am sure you folks have already gone through this multiple time before took this call. LGTM anyways. Nice stuff