Create and implement ForecastApiService interface

Description:

Implement a ForecastApiService interface that allows for the retrieval of weather forecast data for a specific set of coordinates (latitude and longitude) obtained from the GeocodingApiService -> #36 .

User Story:

As a user, I want to receive weather forecast data for a specific city, so that I can plan my activities based on the predicted weather conditions.

Acceptance Criteria:

The service should provide an interface named ForecastApiService with a method to fetch weather forecast data for a given set of latitude and longitude coordinates.
The returned forecast data should include relevant weather information such as temperature, humidity, wind speed, and weather conditions (e.g. sunny, cloudy, rainy).
The service should handle errors gracefully (e.g. invalid coordinates, external API errors) and provide meaningful error messages.
The code should be appropriately documented with comments to explain the functionality and usage of the interface and its methods.
Unit tests should be provided for the implemented methods, with appropriate test cases for different weather conditions and error scenarios.

Mockups or Diagrams (if applicable):

Not applicable for this feature.

Additional Notes:

The implementation should consider the potential for high traffic and implement caching and other optimizations as necessary. The service should use a reliable and accurate source for weather forecast data. Considerations should be made regarding the data source's terms of service, usage limits, and accuracy of the data provided. Additionally, the ForecastApiService interface should be designed with flexibility in mind, allowing for easy implementation of different forecast data providers in the future.

FreakyF / Weather-track