$cursorStreamRaw funtionality

[Joandres-Lara]

Hi, can be added new method for get bached stream with raw queries like:

const stream = await db.$cursorStreamRaw`
 select sum(amount) from account
 group by "userId"
 having sum(amount) > 0
`
for await (const value of stream){
 console.log(value.sum)
}`