Graph simulator init (#196)

# Goal
The goal of this PR is to allow us to do some large scale verification
and stress testing.

Closes #197

# Discussion
<!-- List discussion items -->
- Precomputed state with 20_000 users is uploaded
[here](https://drive.google.com/file/d/1WoQ_INPa4aOy4dCm1WUN9KXxq08P0-Rp/view?usp=sharing)
- Refer to ReadMe for more info

# Computed Scenarios
- Key rotation for random pages in private Follows
- Key rotation for random pages in private Friendship

Cargo.toml

@@ -6,6 +6,7 @@ members = [
     "bridge/jni",
     "log-result-proc-macro",
     "bridge/node",
+    "simulator"
 ]
 
 default-members = [

Makefile

@@ -55,6 +55,17 @@ build-node-download:
 	@echo "Build Bridge by downloading native binaries for GraphSDK..."
 	@cd bridge/node && npm install && npm run native:download
 
+.PHONY: build-sim
+build-sim:
+	@echo "Build Simulator for GraphSDK..."
+	@cargo build --release -p simulator
+
+.PHONY: run-sim
+run-sim:
+	@make build-sim
+	@echo "Running Simulator for GraphSDK..."
+	@( ./target/release/simulator )
+
 .PHONY: dsnp-graph-sdk-jni
 	@cargo build -p dsnp-graph-sdk-jni --profile $(PROFILE)