Use CLI scripts from ethereumjs-config in package.json

[holgerd77]

Ok, wanted to do this short-term PR to have some more confirmation that the new CLI commands actually works, they do. 😄

Realized now with some more distant look that it would be good to have the original command exposed, currently only the command name from config is displayed (before/after):

$ npm run build

> ethereumjs-common@1.0.0 build PATH/EthereumJS/ethereumjs-common
> tsc -p ./tsconfig.prod.json

$ npm run build

> ethereumjs-common@1.0.0 build PATH/EthereumJS/ethereumjs-common
> ethereumjs-config-build

Will directly address in a short PR on config.

[s1na]

Nice! Tested locally, works well!

[holgerd77]

Addressed this in ethereumjs/ethereumjs-config#17.