setAttributes ignored creating a Conversation Participant

[jlrpuma]

Issue Summary

I'm adding participants to a conversation, the participants are added to the conversation but the attributes that I passed to them are completely ignored.

Attributes String example: {"id":1,"username":"xxxxx","firstName":"xxxx","secondName":null,"firstLastName":"xxxxx","secondLastName":null}

Steps to Reproduce

• Create a conversation
• Try to add a Participant with some attributes

Code Snippet

Participant participant = Participant.creator(conversationSid)
                .setIdentity(identity)
                .setAttributes(attributes).create();

Technical details:

• twilio-java version: 7.55.2