Feat/exec in container

[josephgroves]

Feat: Re-implements exec to run command inside container

λ uno exec "bundle exec rails s -b 0.0.0.0 -p 4000"
Executing bundle exec rails s -b 0.0.0.0 -p 4000 inside of ########## container

λ uno exec ######### "bin/webpack-dev-server"
Executing bin/webpack-dev-server inside of ######### container

λ uno exec cms "pnpm i"
Executing pnpm i inside of cms container

λ uno exec cms web
Found web command in procfiles, executing command