Suggestion for improving launch tools

[doutv]

I have several suggestions to launch tools under tools/ directory according to my testing local node experience:

• add docs for running multiple parachains: such as npm run launch -- --parachain moonbase-0.24.0 --parachain moonbase-0.24.0
• add cli flags for relay chain to help testing "--unsafe-rpc-external", "--unsafe-ws-external", "--rpc-cors=all"
• add an option to toggle display generated polkadot-launch config. This can give users more flexibility to edit the launch config. At first, I didn't know the launch.ts actually generate a config file and feed it to polkadot-launch. This is also missing in readme docs. After reading the code and testing I got to know this. I can adapt the generated config file to support launching other parachain.
• (optional) add CLI flags to disable telemetry and prometheus "--no-telemetry", "--no-prometheus". In my case, they are not used.

I can create some PRs if you are interested. Please let me know and I am pleased to help.

[nanocryk]

Looks like good suggestions, feel free to make some PRs for them :)