Add support for "package" argument

[dannymcgee]

With this update, all @nxrs/cargo executors will correctly handle a package key added to the options. This can be useful if (for some reason) you want your Nx project name and your Cargo package name to be different.

For example, given the following project configuration:

# packages/foo/Cargo.toml
[package]
name = "foo-rs"
# ...

# /Cargo.toml
[workspace]
members = ["packages/foo"]

// packages/foo/project.json
{
  "root": "packages/foo",
  // ...
  "targets": {
    "test": {
      "executor": "@nxrs/cargo:test",
      "options": {
        "package": "foo-rs"
        // ...
      }
    }
    // ...
  }
}

Running npx nx test foo should now execute cargo test -p foo-rs