Support secure access for assets #381
Description
Motivation
Customers want to enable secure access to their assets and use the asset-related API keys in the same way as content-related API keys.
Proposed solution
Add support for providing API keys for secure access to assets. Customers are given two API keys, one for production and one for preview.
When secure access for assets is enabled, an asset-related API key must be used for retrieving assets. Otherwise, the API returns an error.
Currently, customers need to create their own custom solutions to make asset requests.