Implement device to device communication manager

[pan-apple]

Problem

Need a class implementation that provides an API that a device/application can use to communicate with another (set of) device/s. At a high level, the class would provide APIs to

1. Initiate secure connection with a peer device. Get notified when the connection is available, or if it failed.
2. Use DNS cache to lookup and manage addresses of peer devices.
3. Use CASE session cache to resume a session, if possible.
4. Maintain a list of active connections for a set of peer devices. So that active connections can be reused.

At a high level, this class is doing a lot of what chip::DeviceController does today. It might be possible to refactor DeviceController to a minimal set of API and use that for Controller as well as Device to Device communication.

[pan-apple]

LRU Cache Template (#11531) can be used to implement DNS Cache and CASE session cache.