Add sample for sentiment analysis

[LakshanWeerasinghe]

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[pcnfernando]

Shall we remove the earlier one?

[LakshanWeerasinghe]

removed from the README but didn't remove the sample.

[pcnfernando]

This sample is then again another HTTP EP integration; my suggestion was to use openAPI client to do the sentiment analysis. Please refer https://ballerina.io/usecases/ai/

[LakshanWeerasinghe]

updated.

[LakshanWeerasinghe]

Closing this PR since we already have sample with openapi connector.