Refactor code to use CQRS and MediatR pattern

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  Description

  This PR refactors the codebase to implement the Command Query Responsibility Segregation (CQRS) and MediatR pattern. The CQRS pattern separates the read and write operations for a data store, while MediatR is used as a mediator to decouple in-process messaging. This refactor improves the codebase's maintainability, scalability, and performance.

Summary of Changes

• Added MediatR library as a dependency to the project.
• Created commands and queries for the User model to encapsulate write and read operations.
• Implemented handlers for the User commands and queries to perform the corresponding operations.
• Modified the UsersController to use MediatR to send commands and queries instead of directly interacting with the User model.
• Created unit tests for the User command and query handlers to ensure their correctness.

Please review and merge this PR to incorporate the CQRS and MediatR pattern into the codebase.

Fixes #3.

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Rollback Files For Sweep

• [ ] Rollback changes to meetingly-webapi/meetingly-webapi/Handlers/UserCommandHandlers.cs
• [ ] Rollback changes to meetingly-webapi/meetingly-webapi/Tests/UserCommandHandlersTests.cs
• [ ] Rollback changes to meetingly-webapi/meetingly-webapi/Controllers/UsersController.cs
• [ ] Rollback changes to meetingly-webapi/meetingly-webapi/Queries/UserQueries.cs
• [ ] Rollback changes to meetingly-webapi/meetingly-webapi/Commands/UserCommands.cs
• [ ] Rollback changes to meetingly-webapi/meetingly-webapi/Handlers/UserQueryHandlers.cs
• [ ] Rollback changes to meetingly-webapi/meetingly-webapi/Tests/UserQueryHandlersTests.cs

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Apply Sweep Rules to your PR?

• [ ] Apply: Leftover TODOs in the code should be handled.
• [ ] Apply: All new business logic should have corresponding unit tests in the tests/ directory.
• [ ] Apply: Any clearly inefficient or repeated code should be optimized or refactored.