Add Openai chat completion methods + support for streaming (#34)

* openAI

* change path

* add response cleaning

* add streaming support

* add whitespace

* pretier

* biome formatting

* Fix type and improve example (#35)

Co-authored-by: Daniel Khoo <daniel.khoo@messari.io>

* replace messari format with openAI

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Co-authored-by: Daniel Khoo <daniel.khoo@messari.io>

Add repo to package.json (#33)

* Add repo

* Bump version number

Add repo to package.json (#33)

* Add repo

* Bump version number