[FEATURE]: generate `ALTER COLUMN` migrations for libSQL

### Describe what you want

When changing a table column in SQLite, Drizzle Kit doesn't automatically generate migrations because SQLite doesn't support altering columns. However, libSQL does support altering columns ([see docs](https://github.com/tursodatabase/libsql/blob/main/libsql-sqlite3/doc/libsql_extensions.md#altering-columns)), which means that automatically generating migrations should be possible when using turso/libSQL as a driver. It would be awesome if the team could add this feature to Drizzle Kit!