(TK-010):Create rest end point on PRS to accept registration request

[Koufan-De-King]

Description:

Develop a REST endpoint in the Pending Registration Service (PRS) to accept and store user registration requests. This endpoint will capture the user's phone number and public key, initiating the registration process and generating an OTP for verification.

Requirements:

Create a POST /prs/register endpoint.
Accept and validate the phone number and public key from the user.
Generate and store an OTP for the registration request.
Return a success response and initiate OTP delivery.

Acceptance Criteria:

Registration requests are stored and OTPs are generated.
The endpoint returns appropriate responses for success or failure.
Estimate: 5