Configures prettier in the scaffolded project to extend the provided
shareable config
Installs the provided shareable config
Installs the related eslint config and configures eslint to use it
Notes
prettier will only be configured if a config scope is defined
the shareable config is expected to define a dependency on prettier, so the
scaffolded project will not be configured to depend directly on prettier
the pretter and eslint config names are defined by convention, so packages
that are named as @<your-scope>/prettier-config and
@<your-scope>/eslint-config-prettier are expected to exist