Gathering information for new (requested) token

Decide whether the new token can be issued and gather the claims that are associated with the issued token.

Procedure

Gather claims for the newly issued token. For a JWT example, set the claims in the attribute container under the type "urn:ibm:jwt:claim":
```
var req_stsuu = new STSUniversalUser();
req_stsuu.addAttribute(new Attribute("act", "urn:ibm:jwt:claim", actClaimsJson.uni_sub));
```

In the delegation flow, add the "act" claims into the STSUU and save it in the database in the post mapping rule.

stsuu.addContextAttribute(new Attribute("act", 
"urn:ibm:names:ITFIM:oauth:body:param", JSON.stringify(actClaimsJson.uni_act)));