[Housekeeping] Add example for tensorflow plugin in flytesnacks

[yindia]

Describe the issue

Currently, we have README.md for TensorFlow plugin, We need an example to test the plugin.

• Flytesnacks example
• Tensorflow plugin docs update (https://github.com/flyteorg/flyte/blob/master/rsts/deployment/plugin_setup/k8s/tensorflow_operator.rst)

What if we do not do this?

We need an example for the TensorFlow plugin, It will help us in functional testing, it will also help us in plugin docs.

Related component(s)

flytesnacks

Are you sure this issue hasn't been raised already?

• Yes

Have you read the Code of Conduct?

• Yes