Add tool for visualizing crate hierarchy (#3315)

* Add tool for visualizing crate hierarchy

* Update crate structure

* Restructure crate viz and integrate crate into workspace

* Remove transitive dependency edges

* Move png / svg creation into the rust binary

tools/crate-hierarchy-viz/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "crate-hierarchy-viz"
+description = "Tool to visualize the crate hierarchy in the Graphite workspace"
+edition.workspace = true
+version.workspace = true
+license.workspace = true
+authors.workspace = true
+
+[dependencies]
+serde = { workspace = true }
+clap = { workspace = true, features = ["derive"] }
+toml = "0.8"
+anyhow = { workspace = true }