fix: avoid to pass apikey

[Kikobeats]

It's used for obtaining the Microlink API URL

sdk/packages/react/src/index.js

Line 51 in 9e5d634

const [apiUrl, apiUrlProps] = useMemo(

Since it isn't more necessary after that, it's preferable to don't pass it around components to avoid leaked it accidentally.

Also, because the default value is undefined, react warns users about that:

Warning: React does not recognize the apiKey prop on a DOM element. If you intentionally want it to appear in the DOM as a custom attribute, spell it as lowercase apikey instead. If you accidentally passed it from a parent component, remove it from the DOM element.

closes #276

[breadadams]

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