Reduce heap allocation during API transformations

[salmanap]

In #558 - we introduced the ability to transform and convert from one API format to another. This requires a lot of object transformations and in parts of the code we are over allocating the heap via TryFrom. We should use as little footprint as we can to reduce the memory allocation. Areas to improve

1. In brightstaff, we need to look at the routing preferences and hence build two objects (one for the router and the other for the upstream llm call). See if we can converge to one
2. The borrow and ownership semantics in request.rs and response.rs require a clone. Can we simplify that to ensure our object creation is simple and not over allocating heap?