Allow cli options to specify starting chains

[npty]

When running npm run start on our CLI, the default chains are launched. However, I would like to add options to allow users to specify which chains to launch at startup.

I propose adding options to specify the desired chains using a comma-separated list. For example:

npm run start --chains evm:avalanche,moonbeam --chains move:aptos,sui

This command would start the EVM chains on Avalanche and Moonbeam, and the Move chains on Aptos and SUI.

I believe that this feature would greatly enhance the flexibility and customization options to running our examples, and would be a valuable addition for our users.

Here's an example script to parse the example command above:

const { program } = require("commander");

function collect(value, previous) {
  return previous.concat([value]);
}

program
  .option(
    "--chains <chains>",
    "comma-separated list of chains to start",
    collect,
    []
  )
  .parse();

const options = program.opts();

const chains = options.chains.reduce((acc, chain) => {
  const [protocol, names] = chain.split(":");
  const chainNames = names.split(",");
  return {
    ...acc,
    [protocol]: chainNames,
  };
}, {});

console.log(chains);

Output

{ evm: [ 'avalanche', 'moonbeam' ], move: [ 'aptos', 'sui' ] }