chore(avm): vm compilation metrics (#7704)

```
% /path/to/aztec-packages/barretenberg/cpp/scripts/analyze_vm_compile_time.sh clang16 bb
VM Total Compilation time(ms): 539039

% cat build-clang16-compiler-profile/avm_compilation_summary.json
[
    {
      "name": "avm_trace/avm_alu_trace.cpp.json",
      "time(ms)": 11563
    },
    {
      "name": "avm_trace/avm_binary_trace.cpp.json",
      "time(ms)": 9615
    },
    {
      "name": "avm_trace/avm_deserialization.cpp.json",
      "time(ms)": 9933
    },
    {
      "name": "avm_trace/avm_execution.cpp.json",
      "time(ms)": 60117
    },
    {
      "name": "avm_trace/avm_gas_trace.cpp.json",
      "time(ms)": 8830
    },
    {
      "name": "avm_trace/avm_helper.cpp.json",
      "time(ms)": 9032
    },
    {
      "name": "avm_trace/avm_kernel_trace.cpp.json",
      "time(ms)": 8271
    },
    {
      "name": "avm_trace/avm_mem_trace.cpp.json",
      "time(ms)": 9633
    },
    {
      "name": "avm_trace/avm_opcode.cpp.json",
      "time(ms)": 2278
    },
    {
      "name": "avm_trace/avm_trace.cpp.json",
      "time(ms)": 17569
    },
    {
      "name": "avm_trace/fixed_gas.cpp.json",
      "time(ms)": 8957
    },
    {
      "name": "avm_trace/fixed_powers.cpp.json",
      "time(ms)": 8296
    },
    {
      "name": "avm_trace/gadgets/avm_conversion_trace.cpp.json",
      "time(ms)": 8487
    },
    {
      "name": "avm_trace/gadgets/avm_ecc.cpp.json",
      "time(ms)": 9261
    },
    {
      "name": "avm_trace/gadgets/avm_keccak.cpp.json",
      "time(ms)": 7960
      {
      "name": "avm_trace/gadgets/avm_pedersen.cpp.json",
      "time(ms)": 8289
    },
    {
      "name": "avm_trace/gadgets/avm_poseidon2.cpp.json",
      "time(ms)": 8536
    },
    {
      "name": "avm_trace/gadgets/avm_sha256.cpp.json",
      "time(ms)": 8177
    },
    {
      "name": "avm_trace/gadgets/avm_slice_trace.cpp.json",
      "time(ms)": 8233
    },
    {
      "name": "generated/avm_circuit_builder.cpp.json",
      "time(ms)": 55427
    },
    {
      "name": "generated/avm_composer.cpp.json",
      "time(ms)": 52066
    },
    {
      "name": "generated/avm_flavor.cpp.json",
      "time(ms)": 45989
    },
    {
      "name": "generated/avm_full_row.cpp.json",
      "time(ms)": 12241
    },
    {
      "name": "generated/avm_prover.cpp.json",
      "time(ms)": 88277
    },
    {
      "name": "generated/avm_verifier.cpp.json",
      "time(ms)": 57994
    },
    {
      "name": "stats.cpp.json",
      "time(ms)": 4008
    }
  ]

  ```

barretenberg/cpp/scripts/analyze_vm_compile_time.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+# This script summarises the compilation time for the vm
+# The summary json file is outputted to $BUILD_DIR/avm_compilation_summary.json
+# it takes in two params the preset(e.g. clang16, clang16-dbg) and a target (e.g. bb, vm) 
+# it can be called like this => ./analyze_vm_compile_time.sh clang16 bb
+set -eu
+# So we can glob recursively
+shopt -s globstar
+
+PRESET="${1:-wasm-threads}"
+TARGET="${2:-barretenberg.wasm}"
+
+BUILD_DIR=build-$PRESET-compiler-profile
+
+cd $(dirname $0)/..
+
+# Run the analyse script if we dont already have the specific directory
+if [ ! -d $BUILD_DIR ]; then 
+    echo -e "\n$BUILD_DIR not found, running $(dirname $0)/analyze_compile_time.sh $PRESET $TARGET"
+    ./scripts/analyze_compile_time.sh $PRESET $TARGET
+else 
+    echo -e "\n$BUILD_DIR found, using existing results"
+fi 
+
+# Run summary analysis
+cd build-$PRESET-compiler-profile
+pushd src/barretenberg/vm/CMakeFiles/vm_objects.dir/ > /dev/null 2>&1
+# Process vm json profiling files and "simplify" them in a summary
+jq -cn 'inputs | .traceEvents | map(select(.name == "Total ExecuteCompiler")) | map({ name: input_filename, "time(ms)": .args."avg ms"})' **/**.cpp.json | jq -s add > avm_compilation_summary.json
+# Compute total time
+TOTAL_TIME=$(jq 'map(."time(ms)") | add' avm_compilation_summary.json)
+echo -e "\nVM Total Compilation time(ms): $TOTAL_TIME"
+popd  > /dev/null 2>&1
+mv ./src/barretenberg/vm/CMakeFiles/vm_objects.dir/avm_compilation_summary.json .
+echo -e "Summary file outputted to $BUILD_DIR/avm_compilation_summary.json"