Tracker for the proposal in #13760.

Milestones

• Add SPI code to main
• Add E2E single server support to main
• Robust Phase-1 implementation, and mark Phase-1 as closed.
• Add support for Instant Vectors

Misc. Tasks

• Fix naming convention of series
• Rename aggInfo
• Fix offset calculation (honor time unit)
• Share example of implementing a function like rate
• Rename ScanFilterAndProjectPlanNode
• Support groupByExpressions and not just columns.
• Add metrics for monitoring
• Error categorization
• Add support for default time columns
• Change Time Series Logical Planner to take in PinotConfiguration instead of a Map.
• Add support for configuring broker response