Telemarketing - Feature/adding custom field

[Suraj-Rajmane]

What problem are you trying to solve?.
At present there are only 3 fields in the impersonating box such as Email, Document and Phone. Client want to add one extra field to the imersonating box called CustomerClass.

Describe the solution you'd like
I am making an api call to get the orderForm Data. From that data we are extracting the CustomerClass and adding it to the impersonating box.

Why do you think this feature should be available to all stores?
I don't think this feature will be useful for all the stores. But VTEX team has suggested to make use of telemarketing app to solve this issue. So I came up with this. But I have taken care that this field will not render for other stores.

Describe alternatives you've considered
I didn't find any alternative solution.

Created PR on Telemarketing Repo
vtex-apps/telemarketing#76