fix: creating ast transformer

[Farenheith]

Adding ast transformer option for extension methods generation

• Create transpilation logic
• Support using extension methods imported from other files
• Avoid using an extension method if the class already has a method with the same name
• Figure out a way to help define the extension methods declaration types in a way that the types throw an error when the user tries to create an extension method with the same name as an existing method in the target class
• Support extension methods to be used from function/methods returns
• Figure out if there's a way to make extension declarations visible only when the file that declares it is imported

[gustavo-rodrigues-dev]

LGTM!

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