fix(interfaces): Make ResponseOptionsArgs an interface

[jacobwindsor]

fix(interfaces): Make ResponseOptionsArgs an interface

As per the Typescript Language Spec having it as an interface means extends, and implements keywords cannot be used. It is unclear why this was declared as a type in the first place

What kind of change does this PR introduce? (check one with "x")

[X] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior? (You can also link to an open issue here)
Is a type definition

What is the new behavior?
Is an interface. Allowing for extends, implements etc.

Does this PR introduce a breaking change? (check one with "x")

[ ] Yes
[X ] No

[mhevery]

Please fix PR to pass the CI.

[vicb]

need to update the public API

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