fix(drizzle-orm): make not() accept SQL | undefined from and()/or()

[kszongic]

Problem

not() only accepts SQLWrapper, but and() and or() return SQL | undefined. This causes a type error when composing them:

await db.query.users.findMany({
  where: not(and(ilike(users.name, '%asdf%')))
})

Solution

Updated not() to accept SQLWrapper | undefined and return SQL | undefined, consistent with and() and or(). When undefined is passed, it returns undefined (no-op), matching the existing pattern.

Changes

• drizzle-orm/src/sql/expressions/conditions.ts: Changed not(condition: SQLWrapper): SQL to not(condition: SQLWrapper | undefined): SQL | undefined

Fixes #1818