added pseudo apiSecureStorage keyword to get async keychain values

[M-Taha-Dev]

Added logic to handle pseudo apiSecureStorage keyword to fetch async values from Keychain manager. The scope of this keyword is in API only.
Sample EDL:

[vusters]

This is hacky and the wrong approach. What you can do is to use the same exact evaluate() function that we used everywhere. The key is to inject the secureStorageMap into the payload IF this is an API call. You should not have to do anything else extra.

[vusters]

this looks good.