Feat: Add Superset Dataset Ingestion/Lineage

[hwmarkcheng]

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub

Description:

Draft PR to enrich Superset Ingestion with relevant metadata
Superset has useful metadata in relation to superset physical (Raw table, 1:1 with say redshift table) /virtual (Custom sql) datasets, e.g owners, their own schema fields, custom sql, etc.

The current iteration of superset ingestion simply just links to the schema/table specified in the API (Which can be inaccurate, especially for virtual datasets). We've added a few changes to enrich the ingestion process.

• Creates Dataset Entity for each physical/virtual dataset in Superset
• Added Schema fields for charts
• SQL parsing for virtual datasets
• Lineage for tables (including virtual datasets), table level lineage for virtual datasets are accurate
• Column level lineage (Working, but low accuracy on retrieving some columns, improvement will likely have to be another contribution)
• Tagging for physical/virtual datasets
• Retrieves owners and metrics from dataset/charts to sync in (WIP, Will map Preset owners to datahub owners, metrics to glossary terms)

[hwmarkcheng]

Seems like our fork is out of sync, will look to resync first