option to rename package name in package.json instead of using the same package name

[funfoolsuzi]

💡 Feature description

I want the option to rename the generated package name in package.json instead of using the same package name from cargo.toml.
Because my cargo package on crates.io has this name that I really like but it is not available on npm anymore.
I don't want to change my package name on crates.io so I have to rename my generated package name to something else.

💻 Basic example

wasm-pack build --package-name my_pkg_on_npm will yield a package.json:

{
  "name": "my_pkg_on_npm",
  "collaborators": [
    "bts<bts@example.com>"
  ],
  "description": "It's an awesome package but the name has already taken on npm  :(",
  "version": "0.1.2",
  ...
}

[jamesmishra]

I think this issue is a duplicate of #427

That said, I agree that it should be possible to change the NPM package name from wasm-pack's command line arguments.

[woile]

This would be nice, specially to set the scope of an org. I wonder if we could have some settings in the Cargo.toml to customize the package.json 🤔