Saved Objects Storage and Installation

[spg-matt]

We need to design a way to store the various saved objects that get stored with a source and design a way to install them when a channel is created.

We're already using the saved objects API, which is no different for other types of saved objects like visualizations and dashboards. Other than the order of insert can be important and in the case of dashboards saved objects can reference each other.

We could make this a script that we execute per source installation, which will set the stage for ousting node red. Or we can make these more handlebar formatted JSON templates. Then we'd have to figure out a way to specify install order and referencing.