Add Additional Deployment Models

[andorsk]

Add additional deployment models to the spec, such as aggregators, to address scalability.

[andorsk]

graph TD
    subgraph Local_DWNs
        L1[Local DWN 1]
        L2[Local DWN 2]
        L3[Local DWN 3]
    end

    subgraph Remote_DWNs
        R1[Remote DWN 1]
        R2[Remote DWN 2]
        R3[Remote DWN 3]
    end

    L1 -->|sync| R1
    L2 -->|sync| R2
    L3 -->|sync| R3
    R1 -->|write| A1[Aggregator]
    R2 -->|write| A1[Aggregator]
    R3 -->|write| A1[Aggregator]

    A1 -->|read| DWN

[andorsk]

notes: patterns section companion guide