datetime clinet functionality

[dohaelsawy]

this pull request should make the following

issue link codescalersinternships/home#286

Requirements:

1. Client Functionality:

   • Implement functions to call each datetime server endpoint
   • Handle different response formats (JSON, plain text)
   • Implement proper error handling and timeouts

2. Configuration:

   • Allow configuration of server URLs and ports
   • Support for environment variable configuration

3. Retry Mechanism:

   • Implement a simple retry mechanism with backoff for failed requests: Check https://pkg.go.dev/github.com/cenkalti/backoff/v4 or similar

4. Testing:

   • Unit tests for client functions
   • Integration tests using a mock server

5. Documentation:

   • Provide godoc-style comments for all exported functions
   • Include usage examples in the README

6. Logging:

   • Implement structured logging for client operations

Optional Enhancements:

• Implement a simple CLI interface for the client

[dohaelsawy]

Done, waiting for reviews :D