How can I seed Marquez with my own OpenLineage events?

[wslulciuc]

Let's write a blog post on how users can seed Marquez with their own OpenLineage events! Topics may include:

• How can I use the mqz seed cmd to seed Marquez with OL events defined in a file?
• How can OL events be exported using mqz db export > metadata.json stored in Marquez?