Add new variable _PER_REQUEST_SCRIPT

Problem

Some forms of API authentication combine portions of the HTTP request with a secret. Recently we have had several customers request this feature, a workaround exists using the legacy configuration file and a deprecated version of Python 2.7. This is not optimal as customers must manually upgrade the configuration file if changes are made, such as adding a new check.

Proposal

Add a new variable DAST_API_PER_REQUEST_SCRIPT allowing a user to provide the filename for a script. The contents of the script will be merged into the configuration file provided by worker-entry to API Security.