…ced scalability and clarity

- Refactored chargily.go by dividing it into separate files: params.go, responses.go, and types.go.
- Moved these model files into a newly created models package to improve separation of concerns.
- Enhanced maintainability and clarity by organizing related structures and defintions.

…he chargily objects types

…_errors.go) in one utils folder for more calrity and structure organization

… custom error

Refactor/utils

Moved all methods into dedicated files to enhance organization. Refactored the Client struct to provide a unified interface for accessing all SDK functionalities, improving usability and maintainability.

Moved individual functions into separate files for better organization. Implemented a consistent interface across different entities, allowing unified access to functions such as customers.get(), products.get(), customers.create(), and prices.create(). This enhances usability and simplifies interaction with the SDK.

Refactor/client/services

…ocus. using the new updates made to the project

…ocus. using the new updates made to the project

…amples making it more easy to read and understand the logic flow.

Update/examples

…tData & webhook event type

…te & a public method the verify the signature sent by chargily

…ature verification

New/webhook/signature-verifier

…nts ...), params & returns explained. example for each function of the services

Update/docs/examples

Refactor/improve architecture