Predefined schemas for GA4, Segment, Snowplow, RudderStack, and Amplitude

[jdorn]

TODO:

• Choose a predefined schema format when editing data source queries (or choose "Custom")
• Auto-populate initial experiment/identity queries based on the selected schema
• Add a table_prefix setting for data sources
• Support more SQL placeholders for BigQuery (startYear, startMonth, startDay, endYear, endMonth, endDay)
• Only show GA4 option when datasource type is "bigquery"
• Queries for GA4
• Queries for Segment
• Queries for Snowplow
• Queries for Rudderstack
• Queries for Amplitude
• Update docs for SQL placeholders
• Auto-populate initial metric queries based on the selected schema
• When GA data source type is selected, show warning that GA4 requires setting up BigQuery and link to a tutorial
• Add back-end tests for SQL placeholder logic
• Test generated queries

Future work:

• Queries for Matomo
• Queries for Jitsu
• Show "firstTime" query modal when adding a datasource within settings
• Ability to edit the tablePrefix and schema format for existing data sources
• Update docs to mention predefined schemas

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