Bug: String.url(with: ImageTransform) method is internal but should be public #104

Bug: String.url(with: ImageTransform) method is internal but should be public
The url(with: ImageTransform) method in the String extension is marked as internal, making it inaccessible from app code, but it should be public based on:

Full API documentation with @parameter, @returns, @throws (internal methods don't get this level of docs)

Official documentation shows public usage examples: let result = urlString.url(with: transform) -> https://www.contentstack.com/docs/developers/sdks/content-delivery-sdk/swift/reference#quality_

Test cases in UtilsTest.swift demonstrate intended functionality but require @testable import to access