Check for unused dependencies

[gabrielbosio]

We should check if there are dependencies listed in the VM’s Cargo.toml which are not currently being used. Also, we should check wether there are some whose use is quite trivial and could be replaced by implementing its functionality.

For example, using cargo-machete, we can see that the following dependencies are not currently in use:

• cairo-vm-tracer (./cairo-vm-tracer/Cargo.toml):
  • tower
• cairo1-run (./cairo1-run/Cargo.toml):
  • cairo-lang-sierra-ap-change
  • cairo-lang-sierra-gas
  • cairo-lang-starknet-classes
  • mimalloc
• wasm-demo (./examples/wasm-demo/Cargo.toml):
  • serde_json
• cairo-vm-cli (./cairo-vm-cli/Cargo.toml):
  • nom