[FND-3] Release 7.0.0

[lucassus]

This pull request updates the documentation and SDK references for the Maxio Advanced Billing API, focusing on improving clarity, upgrading SDK versions, and standardizing response types. Key changes include updating links and examples to reflect the latest SDK version, enhancing the descriptions of API responses, and restructuring the documentation for better usability.

Documentation Updates:

• Updated SDK version references in README.md and related documentation from 6.1.0 to 7.0.0, including links to new SDK documentation and examples. [1] [2]
• Improved descriptions of API response types to clarify the usage of the ApiResponse interface and its result property. This change applies to multiple API methods across the documentation. [1] [2] [3] [4]
• Added a usage example for the ApiResponse interface in doc/api-response.md to demonstrate handling API responses and errors.

SDK Configuration and Parameters:

• Standardized the presentation of configurable parameters for the API client, linking to detailed documentation for HttpClientOptions and RetryConfiguration.
• Enhanced descriptions of pagination parameters (perPage, page) in API methods for better readability and understanding.

Miscellaneous Improvements:

• Updated terminology and formatting in README.md for consistency, such as renaming sections and refining example commands.
• Replaced inline type definitions with links to their respective documentation for better maintainability and clarity. [1] [2]