Implement V7 beta endpoints

[harm-smits]

V7 adds a variety of exciting new endpoints, I will implement these and guard them with a define I suppose

• GET /advertiser/sponsored-products/advertiser-performance - Get advertiser performance;
• GET /advertiser/sponsored-products/ad-group-performance/{ad-group-id} - Get the performance of an ad group by ad group id;
• GET /advertiser/sponsored-products/campaign-performance/{campaign-id} - Get the performance of a campaign
• GET /advertiser/sponsored-products/campaigns - Retrieve all campaigns for a specific advertiser.
• POST /advertiser/sponsored-products/campaigns - Create a new campaign
• GET /advertiser/sponsored-products/campaigns/{campaign-id} - Get a campaign by campaign id.
• PUT /advertiser/sponsored-products/campaigns/{campaign-id} - Updates a campaign.
• GET /advertiser/sponsored-products/keyword-performance/{ad-group-id} - Get performance results of keywords by ad group id
• GET /advertiser/sponsored-products/product-performance/{ad-group-id} - Get the performance of a product within an ad group
• GET /advertiser/sponsored-products/search-term-performance/{ad-group-id} - Get performance results per search term within an ad group
• GET /retailer/process-status - Get the status of an asynchronous process by entity id and event type for a retailer
• POST /retailer/process-status - Get the status of multiple asynchronous processes by an array of process status ids for a retailer.
• GET /retailer/process-status/{process-status-id} - Get the status of an asynchronous process by process status id

[Showkiip]

Can share complete integration please