Remove unused methods on Page
Convert Page size to be a long in bytes

Simplify OperatorContext stats
Remove Page dependencies on Guava
Remove Page.getSingleValueBlocks(position)
Move Page to SPI
Remove PageBuilder dependencies on Guava
Move PageBuilder to SPI
Add ConnectorPageSource to SPI

Move ConnectorDataStreamProvider to SPI and rename to ConnectorPageSourceProvider
Simplify InformationSchemaPageSourceProvider using a FixedPageSource
Replace AlignmentOperator with RaptorPageSource
Merge InternalConnector into Connector