diagnostics logging output configuration

[thescientist13]

Summary

In a few areas of Greenwood there is output logging that is worth sharing with the user, but in some cases, while informative, is not always actionable by the user.

For example

• rollup.config.js - https://github.com/ProjectEvergreen/greenwood/blob/v0.31.0-alpha.5/packages/cli/src/config/rollup.config.js#L606
• CSS parsing - https://github.com/ProjectEvergreen/greenwood/blob/v0.31.0-alpha.5/packages/cli/src/plugins/resource/plugin-standard-css.js#L19
• import map generation - https://github.com/ProjectEvergreen/greenwood/blob/v0.31.0-alpha.5/packages/cli/src/plugins/resource/plugin-node-modules.js#L79

I think it would be useful to give the user the ability to turn these on or off through a key in greenwood.config.js

Details

The idea is to expose a configuration property in _greenwood.config.js

export default {
  diagnostics: true|false // default is true
}

This would then enable / disable logging the following cited areas above.

I think when off, we should at least log out that diagnostics have been turned off, and / or maybe link to the website about the configuration option?