Enrichment extracting canonical properties into dedicated contexts

[chuwy]

Full write-up: https://docs.google.com/spreadsheets/d/1UaXrH92IvRWyXNU8wUQ-oxvEI9kJxoxbIcbRjna7RAI/edit?usp=sharing

• [ ] More unit tests
• [ ] More enrichments (at least cover all Context+Enrichment all above spreadsheet)
• [ ] Better schemaing for new contexts
• [ ] Publish schemas to Iglu Central
• [ ] Copyright notices