feat(random_generate): Random username and mail generation for test.

[userAdityaa]

PR Description

This PR introduces a feature for dynamically generating random usernames and emails to enhance test scenarios where placeholder data like {{username}} and {{email}} is used. The implementation ensures variety and uniqueness in the generated data to simulate real-world use cases effectively.

• Closes Implement Mock Data provider for API Testing #496

Checklist

• I have gone through the contributing guide
• I have updated my branch and synced it with project main branch before making this PR
• I am using the latest Flutter stable branch (run flutter upgrade and verify)
• I have run the tests (flutter test) and all tests are passing

OS on which you have developed and tested the feature?

• Windows
• macOS
• Linux

Change

Screen.Recording.2024-11-23.at.12.26.19.AM.mov

[userAdityaa]

Hey @ashitaprasad, Can you please review this one ?

Suggested more change:

• Writing lorem{number} should generate random text paragraph.
• Generate Date and Time.
• Generate Phone number.

[ashitaprasad]

Closing the PR as you did not discuss your approach on the issue thread and directly sent the PR.
As this is a low priority feature, it will only taken up after other high priority features are added.