chore: add script to print lines of code (noir-lang#4991)

# Description

## Problem\*

Resolves <!-- Link to GitHub Issue -->

## Summary\*

This PR adds a small script to print out the LOC for various sections of
the codebase. Adding weightings will come in a later PR. Note that this
PR relies on my fork of tokei which has support for Noir source code.

cc @Rumata888

## Additional Context



## Documentation\*

Check one:
- [x] No documentation needed.
- [ ] Documentation included in this PR.
- [ ] **[For Experimental Features]** Documentation to be submitted in a
separate PR.

# PR Checklist\*

- [x] I have tested the changes locally.
- [x] I have formatted the changes with [Prettier](https://prettier.io/)
and/or `cargo fmt` on default settings.

.tokeignore

@@ -0,0 +1,12 @@
+docs
+scripts
+
+# aztec_macros is explicitly considered OOS for Noir audit
+aztec_macros
+
+# config files
+*.toml
+*.md
+*.json
+*.txt
+*.config.mjs

scripts/count_loc.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+set -eu
+
+# Run relative to repo root
+cd $(dirname "$0")/../
+
+if ! command -v "tokei" >/dev/null 2>&1; then
+    echo "Error: tokei is required but not installed." >&2
+    echo "Error: Run \`cargo install --git https://github.com/TomAFrench/tokei --branch tf/add-noir-support tokei\`" >&2
+
+    exit 1
+fi
+
+echo ""
+echo "Total:"
+
+tokei ./ --sort code
+
+echo ""
+echo "ACIR/ACVM:"
+tokei ./acvm-repo --sort code
+
+echo ""
+echo "Compiler:"
+tokei ./compiler --sort code
+
+echo ""
+echo "Tooling:"
+tokei ./tooling --sort code
+
+echo ""
+echo "Standard Library:"
+tokei ./noir_stdlib --sort code