Add Exception Handler, and add APIs

[picksitquick]

Describe the bug
Prerequisite:

• Error Handling in Spring Boot.
• API Calls.

This Task contains 2 sub task:

(1) Add Exception Handler: please refer to the existing exception directory in order to understand how to make custom exception handler classes.

• Make exception handler for HTTP status codes: 400 and 500, and add/throw them wherever necessary in the API calls for Studios.

(2) Make API calls:

• Add API path /studios/users/{lastName} and /studios/users/{phoneNumber} in Studio Controller.

Expected behavior

• API calls should exactly return the data that is expected.
• For example: /users/skill/1 should return user with skill Id 1.
• Custom Error response should be displayed when respective error scenario comes up.
• Test your error handler by passing invalid inputs.

Creating a New Branch
Make sure to create a new branch, use the naming convention: "your_git_username/exceptions"

Reference
You can view the Exception and Controller classes created in user-services repository to get reference/setup.

Raise a PR
Once the task is completed, make sure to raise a PR so that we can view your changes.

Due Date
10th Sept 2023
Deadline extended:
16th Sept 2023