feat(billing): implement tenant subscription entitlements system (milestones 0-6)

config/placement/dev.json

@@ -0,0 +1,6 @@
+{
+  "revision": "dev",
+  "aggregate_placement": { "placements": [] },
+  "projection_placement": { "placements": [] },
+  "runner_placement": { "placements": [] }
+}

config/routing/dev.json

@@ -0,0 +1,27 @@
+{
+  "revision": 1,
+  "aggregate_placement": {
+    "tenant-a": "local",
+    "t1": "local",
+    "t2": "local"
+  },
+  "projection_placement": {
+    "tenant-a": "local",
+    "t1": "local",
+    "t2": "local"
+  },
+  "runner_placement": {
+    "tenant-a": "local",
+    "t1": "local",
+    "t2": "local"
+  },
+  "aggregate_shards": {
+    "local": ["http://aggregate:50051"]
+  },
+  "projection_shards": {
+    "local": ["http://projection:8080"]
+  },
+  "runner_shards": {
+    "local": ["http://runner:8080"]
+  }
+}