Add dependency kind to BRP

[Zeophlite]

Objective

• Expose information about the dependency over BRP

Solution

• Add DependencyData to the dependency field in schedule.graph
• DependencyData has kind: DependencyKind which is "Strict", "Weak", "BuildPass" (note that when added by build pass its always strict)

Testing

• cargo run --example server --features="bevy_remote"
• curl -d'{"jsonrpc":"2.0","method":"schedule.graph","id":1,"params":{"schedule_label":"PostUpdate"}}' -X POST -H "Accept: applcation/json" -H "Content-Type: application/json" http://127.0.0.1:15702 | jq '.' > PostUpdate.json

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "schedule_data": {
      "dependency": [
        [
          {
            "System": 70
          },
          {
            "SystemSet": 178
          },
          {
            "kind": "Strict"
          }
        ],
        ...
      ],
      ...
    }
  }
}