[`polling-controller`] `network-controller` should be a direct dependency, not a peer dependency

[mcmire]

polling-controller seems to only use types from network-controller and does not talk to this controller. Therefore, its dependency on network-controller should be defined under dependencies, not devDependencies + peerDependencies.

Fixing this would reduce the number of packages that need to be released if a major version of network-controller is released.