v1.2.0: Implement generated user impersonation

[david-r-cox]

This PR implements user generation for KeyHippo.

The new feature allows administrators to create test users quickly and easily, which can then be used with the existing impersonation system.
Main changes:

• Implemented keyhippo_impersonation.generate_random_user_data() function to create random user data
• Created keyhippo_impersonation.generate_new_user() function to insert new test users into auth.users

Integration with existing impersonation features:

1. Generate a new test user:

   SELECT keyhippo_impersonation.generate_new_user();

   This returns a new user_id.

2. Impersonate the newly created user:

   CALL keyhippo_impersonation.login_as_user(new_user_id);

3. Perform actions as the impersonated user

4. End the impersonation session:

   CALL keyhippo_impersonation.logout();

This workflow allows administrators to quickly create test users with varied attributes and immediately impersonate them, facilitating thorough testing of user-specific features and permissions.

Mega Launch Week day 4!