Draft: [SingleStore] Add SingleStore connector

[mitchwadair]

This PR intends to add SingleStore support to Drizzle ORM. SingleStore is a distributed SQL database that unifies both transactional and analytical workloads. It is largely compatible with MySQL, but there are some incompatibilities and additional features that are supported.

Things done:

• Add singlestore-core
  • Based on MySQL
  • Disallow foreign keys
  • Add MINUS (a synonym of EXCEPT) (doc)
  • Disallow INTERSECT ALL and EXCEPT ALL
  • Disallow triggers
  • Remove check constraints
  • Add database milestones and branching
    • CREATE MILESTONE (doc)
    • DROP MILESTONE
    • ATTACH DATABASE (doc)
    • DETACH DATABASE (doc)
  • Full-text search capability (doc)
  • Updated relational queries to fix MySQL incompatibilities
• Add singlestore driver. It is mostly the same as the mysql2 driver as well, as it is 100% compatible due to SingleStore supporting the MySQL protocol over the wire. It just removes the mode because that was specific to MySQL and Planetscale

Notable Changes:

• Renamed all references from MySQL to SingleStore in the integration tests directory.
• Modified timestamp precision and other minor test adjustments
• Updated the test environment to use the SingleStore dev Docker image.

Known Issues:

• SingleStore does not order by by default, so some test expectations (set operation tests in particular) were modified to expect SingleStore-specific behavior
• ORDER BY and LIMIT cannot be chained together.
• INTERSECT ALL, EXCEPT ALL, and nested transaction operations are not supported and associated tests were removed
• Only one isolationLevel is supported, so associated tests and config options were removed

Things TODO in Future PRs:

• Add multiple column types that SingleStore supports
  • VECTOR (doc)
  • BSON (doc)
  • Geospatial types (doc)
    • GEOGRAPHYPOINT
    • GEOGRAPHY
  • BLOB types (doc)
  • UUID/GUID (doc)
    • These will be unique type aliases for supporting the UUID() and GUID() generator functions
• Adapt Drizzle Kit to the above changes
• Testing
• Doc
• Support Pipelines (doc)
• Support both columnstore and rowstore tables (currently only columnstore)

[mitchwadair]

TODO rm