fix: custom code away classname clashes and auth error

[ms-jpq]

hihi! 👋:

PR to fix away two issues with current kotlin SDK that prevents compilation / CI release.

• Class name List clashes with kotlin's builtin collections' List -> fixed via adding qualifications to kotlin built-in List

• The API Key should go in query param not headers :)

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[Ahmedhossamdev]

Hi @ms-jpq

I appreciate you taking the time and effort to fix this.
Thank you