chore(justfile): add pnpm install to init (#7297)

Recently, due to some issues, I had to re-clone the oxc project multiple
times. After running `just init`, I always had to run `pnpm install`
separately. We could include `pnpm install` to init command to
streamline the process. In addition, I propose to include
`cargo-binstall` in the init command.

I'm not sure if we should include the `submodules` command in the init
command, as it is generally unnecessary for most users unless they are
working on specific projects like the minifier.

justfile

@@ -16,7 +16,10 @@ alias new-typescript-rule := new-ts-rule
 # or install via `cargo install cargo-binstall`
 # Initialize the project by installing all the necessary tools.
 init:
+  # Rust related init
   cargo binstall watchexec-cli cargo-insta typos-cli cargo-shear dprint -y
+  # Node.js related init
+  pnpm install
 
 # When ready, run the same CI commands
 ready: