`echidna init` subcommand to generate config file

[0xalpharush]

Let's make it easy for users to configure their project by generating the config. Note, it should not overwrite existing config unless it's with --force. https://github.com/crytic/echidna/blob/master/tests/solidity/basic/default.yaml

[PatStiles]

I am interested in taking this on, but for the record I am noob city USA

[arcz]

I'm afraid having echidna init subcommand will require moving the current CLI to a subcommand as well and will break the existing interface. Any other ideas for the interface?