feat(gatsby-plugin-google-analytics): Pass event object to the user's onClick callback in OutboundLink

[maciekmaciej]

Description

Pass event object to the user's onClick callback

[pieh]

Thanks @asistapl! :)

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[dance2die]

Thank you guys. This is indeed working now~

I had a trouble of having to add event listeners for ouboundlink generated anchors but now it works perfect.

https://github.com/dance2die/landing-page-v3-gatsby/blob/master/src/components/util/index.js#L5