Add a command to NTAF to visualise a rendered configuration file

[ncheutin]

As of now, it is complicated to visualise a full configuration as many small parts are merged together, especially when using realms.

The goal is to have an easy way to visualise a "merged" version of a targeted configuration.

One example would be:

• npx ntaf see-config --> show config by default
• npx ntaf see-config wdio.local.conf.js --> show config wdio.local.conf.js
• npx ntaf see-config --realm=staging --> show config conf/realm/staging.js

[racodond]

Very good idea!