Improved Static SQL

[elcritch]

• Adds static API variants of createTable and dropTable
• Fixes table quoting (on postgres) in dropTable
• Adds an opt-in static schema import path for importModel:
  importModel(..., includeStatic = true) now builds model metadata directly from
  the .sql file at compile time, exposes the raw SQL as a global sqlSchema, and avoids
  relying on a generated .nim model file. The default path still uses tools/ormin_importer,
  which now only handles normal file generation through the shared generator code.