change in architecture

composer.json

src/Mailchimp.php

src/Mailchimp/Abstract.php

src/Mailchimp/AuthorizedApps.php

src/Mailchimp/Automation.php

src/Mailchimp/BatchOperations.php

src/Mailchimp/CampaignFolders.php

src/Mailchimp/Campaigns.php

src/Mailchimp/Conversations.php

src/Mailchimp/EcommerceCarts.php

src/Mailchimp/EcommerceCustomers.php

src/Mailchimp/EcommerceOrders.php

src/Mailchimp/EcommerceOrdersLines.php

src/Mailchimp/EcommerceProducts.php

src/Mailchimp/EcommerceProductsVariants.php

src/Mailchimp/EcommerceStores.php

src/Mailchimp/FileManagerFiles.php

src/Mailchimp/FileManagerFolders.php

src/Mailchimp/Lists.php

src/Mailchimp/ListsSegments.php