feat(cli): remove default cjs format

[tzachbon]

BREAKING

closes #1854

[barak007]

There is another change we can make for the cli interface and that's to be able to emit output and also build index I the same command. Right now if you add indexFile it will not emit assets.
Maybe should be added to the v5 issue

[tzachbon]

There is another change we can make for the cli interface and that's to be able to emit output and also build index I the same command. Right now if you add indexFile it will not emit assets. Maybe should be added to the v5 issue

Agreed, I'll add it to the issue and we will change it in a different PR.