feat(pages-components): add enableYextAnalytics to window

[mkilpatrick]

This adds the enableYextAnalytics function to the window. According to our documentation:

The site implementer must ensure their website is explicitly opted out of Analytics; for website implemented using Pages, this can be done by setting requireOptIn to true on the AnalyticsProvider component.
After user’s relevant consent, enable the Yext analytics pixel by calling the function window.enableYextAnalytics();.

enableYextAnalytics was never something exposed by this library. It was always something the Consulting starter exposed and became standard practice. Since it's part of our official documentation the library should add the explicit support.

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Latest commit: cd0705f

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