Split up the drizzle-orm package

[lppedd]

Hey! I know that the philosophy seems to be a single package containing everything for simplicity, but to be entirely honest, just importing drizzle or text (for columns) results in dozens of choices to pick from.

If I'm working on SQLite, I definitely do not need to see other DBs' integrations. Splitting up would drastically reduce the amount of types IDEs need to index and keep in memory, and would reduce the overhead of fiddling with imports every time.