refactor(users): Separate signup and signin

[ThisIsMani]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

Separate signup and signin apis.

Additional Changes

• This PR modifies the API contract
• This PR modifies the database schema
• This PR modifies application configuration/environment variables

Motivation and Context

How did you test it?

Postman.

• Signup - Email should be a non-registered one. (This can't be tested in sandbox)

curl --location 'http://localhost:8080/user/signup' \
--header 'Content-Type: application/json' \
--data-raw '{
    "email": "email",
    "password": "password"
}'

If the request is correct, you will get the following response

{
    "token": "JWT Token",
    "merchant_id": "merchant_id",
    "name": "username",
    "email": "email",
    "verification_days_left": null,
    "user_role": "org_admin"
}

• Signin - Email should be a registered one.

curl --location 'http://localhost:8080/user/signin' \
--header 'Content-Type: application/json' \
--data-raw '{
    "email": "email",
    "password": "password"
}'

If the request is correct, you will get the following response

{
    "token": "JWT Token",
    "merchant_id": "merchant_id",
    "name": "username",
    "email": "email",
    "verification_days_left": null,
    "user_role": "org_admin"
}

• Connect Account - Email can be registered or not,

curl --location 'http://localhost:8080/user/connect_account' \
--header 'Content-Type: application/json' \
--data-raw '{
    "email": "email"
}'

If the request is correct, you will get the following response

{
    "is_email_sent": true
}

• Signup with merchant id - Email should be non-registered,

curl --location 'http://localhost:8080/user/signup_with_merchant_id' \
--header 'Content-Type: application/json' \
--data-raw '{
    "email": "email",
    "password": "password",
    "name": "name",
    "company_name": "Hyperswitch"
}'

If the request is correct, you will get the following response

{
    "is_email_sent": true
}

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed the submitted code
• I added unit tests for my changes where possible
• I added a CHANGELOG entry if applicable

[racnan]

combine with above

[ThisIsMani]

This can't be combined because the above function doesn't return UserFromStorage.