OIDC address claim is incorrectly formatted in the ID token when it is multi-valued attribute

[ratnajothy]

Describe the issue:
$title issue happens because [1] handles the address claim as JSONObject but in [2] it's converted toString.

[1] https://github.com/wso2-extensions/identity-inbound-auth-oauth/blob/35d2b91f19d322dd2e923025d1c90c257cee024d/components/org.wso2.carbon.identity.oauth/src/main/java/org/wso2/carbon/identity/openidconnect/OpenIDConnectClaimFilterImpl.java#L388
[2] https://github.com/wso2-extensions/identity-inbound-auth-oauth/blob/35d2b91f19d322dd2e923025d1c90c257cee024d/components/org.wso2.carbon.identity.oauth/src/main/java/org/wso2/carbon/identity/openidconnect/DefaultOIDCClaimsCallbackHandler.java#L627

How to reproduce:

1. Assign the local claim for address with name of address under http://wso2.org/oidc/claim
2. Mapped the new address claim into OIDC Scope under openid
3. Save the value of address attribute in a user's profile as:address1:qwerty,address2:Medavakkam,city:Chennai,state:Tamilnadu,country:India
4. Add address local claim and mark it as a mandatory claim in a service provider for which the above user is authorised.
5. Login with this user credentials to the application and get the ID token.
6. Introspecting this token's content shows the address claim in below malformed format:

  "address": [
    "{\"address\":\"address1:qwerty",
    "address2:Medavakkam",
    "city:Chennai",
    "state:Tamilnadu",
    "country:India\"}"
  ]

Expected behavior:
Introspecting the token should show the multi-valued address as a properly formatted array:

"address": [
    "address1:qwerty",
    "address2:Medavakkam",
    "city:Chennai",
    "state:Tamilnadu",
    "country:India"
  ]

Suggestion:
Consider changing below code statements in [2],

String claimValue = claimEntry.getValue().toString();
String claimKey = claimEntry.getKey();

into the following:

String claimKey = claimEntry.getKey();
String claimValue = claimEntry.getValue() instanceof JSONObject? ((JSONObject) claimEntry.getValue()).getAsString(claimKey): claimEntry.getValue().toString()

• Product Version: IS 5.10.0