Add a tracking header

[petrsvihlik]

There's a tracking header called X-KC-SOURCE that you can add to your plugin. We'll be then able to measure the adoption of your plugin and send you statistics of API calls made through the plugin.

You can set the header via the Kentico Kontent Delivery SDK.

v5 JS SDK approach: kontent-ai/gatsby-packages@e3612ae

v6 JS SDK: https://github.com/Kentico/gatsby-source-kentico-cloud/blob/js-sdk-ugrade-v6/src/gatsby-node.js#L96 or https://github.com/Kentico/gatsby-source-kentico-cloud/blob/master/src/gatsby-node.js#L96

[CMeeg]

Thanks @petrsvihlik - sounds good, I will take a look.