Sdk implementation

Niko Belokolodovrequested to merge
feature/sdk-implementation into main

This MR implements first iteration of Golang SDK for GitLab Analytics.

The documentation described the added methods and their api.

Folder /exampled has a bash script to verify the events in Snowplow Micro.

Related to gitlab-org/gitlab#572747

Edited by Niko Belokolodov

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