api: add custom `BaseContext` function
api: add custom `BaseContext` function

This sets the context for every request handled by the server (in our case, the daemon).
As a result, on shutdown, we can cancel this context in the `ServerShutdown` function
in `configureAPI`.

Signed-off by: Ian Vernon <ian@cilium.io>

michi-covalent/cilium,tgraf/cilium,tklauser/cilium,michi-covalent/cilium,tklauser/cilium,michi-covalent/cilium,cilium-team/cilium,tgraf/cilium,tklauser/cilium,tgraf/cilium,cilium/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,tgraf/cilium,tgraf/cilium,michi-covalent/cilium,tgraf/cilium,cilium/cilium,cilium-team/cilium,cilium/cilium,tklauser/cilium,cilium/cilium