[HIDTREAS-97] Set up events integration and client signup data storage

[jkan172]

Description
We need to implement two key features:

• Set up and add events from the payload to the system.
• Store client information (first name, last name, email) in the database upon signup.

AS A: system administrator,
I WANT: to set up and add events from a given payload,
SO THAT: events can be properly captured and available for use in the application.

AS A: system administrator,
I WANT: all client signup details (first name, last name, email) stored in the database,
SO THAT: we have a record of all clients for communication and management purposes

AC's:

• Events from the payload are successfully processed and added to the system.
• Events can be verified in the database or relevant storage.
• On client signup, first name, last name, and email are captured.
• Client information is stored in the database without errors.
• Database schema is updated (if necessary) to include required fields.