Rust migration with rust-prisma-client and axum

[paahaad]

This PR proposes an idea: if we're building the backend in Rust, why not consider using the Rust Prisma client? Most of the schema design, relationships, and query logic are already in place, which makes it a good fit.

This PR included:

1. Axum setup in different folder
2. Prisma-cli setup

• to schema sync

cargo prisma db push

• to generate prisma client

cargo prisma generate

example:
This node.js code is

const user = await client.user.upsert({
       where: {
            number
        },
        create: {
            number,
            name: ""
        },
        update: {

        }
    })

equivalent to

let db = db
        .user()
        .upsert(
                user::number::equals(payload.number.to_string()), // where clause
                user::create(payload.number.clone().to_string(), "".to_string(), vec![]), //create clause
                vec![], // update clause
             )
         .exec()
         .await;

3. zod like input validations

#[derive(Debug, Validate, Deserialize)]
pub struct SignupVerifyPayload {
    #[validate(length(min = 9, max = 13, message = "Invalid Number"))]
    number: String,

    #[validate(length(min = 6, max = 6, message = "OTP should be of lenght 6"))]
    otp: String,

    #[validate(length(min = 1, max = 255, message = "Username cannot be empty"))]
    name: String,
}

Note: This PR implements a single endpoint as a demo using the existing Prisma schema. If you think this approach could work, I'd be more than happy to migrate the entire codebase to Rust!