List of stripe API validation errors

# Problem

This issue should serve as a list of Stripe API validation error responses, which we can later use to implement validation error rendering during account setup:

## List of errors

Note: `stripity_stripe` responses are all tuples - `{:error, error_struct}`

List of error structs encountered:

```Elixir
%Stripe.APIErrorResponse{
code: nil,
message: "US ID numbers must be 9 characters long",
status_code: 400, type: "invalid_request_error"
}
````

This one seems to be a bug, created issue for it - https://github.com/code-corps/code-corps-ember/issues/934

```Elixir
%Stripe.APIErrorResponse{
code: nil,
message: "Missing required param: ip.",
status_code: 400,
type: "invalid_request_error"
}
```