cvm-rs: merge guac and jpeg libs together into one

doesn't really need to be two seperate libraries. also preperation for other funnies

the build script has been replaced with a much saner justfile which uses much saner "yarn workspace" invocations instead of blindly cding all over the place

cvm-rs/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "@cvmts/cvm-rs",
+  "version": "0.1.0",
+  "packageManager": "yarn@4.1.1",
+  "type": "module",
+  "main": "index.js",
+  "types": "index.d.ts",
+  "scripts": {
+    "build": "cargo-cp-artifact -nc index.node -- cargo build --release --message-format=json-render-diagnostics",
+    "install": "yarn build",
+    "test": "cargo test"
+  },
+  "devDependencies": {
+    "cargo-cp-artifact": "^0.1"
+  }
+}