Add DevOnly component

[stafyniaksacha]

Describe the feature

A component to render it slot only during dev would be useful in some cases.

The content should be tree shaken during build

Additional information

• Would you be willing to help implement this feature?
• Could this feature be implemented as a module?

Final checks

• Read the contribution guide.
• Check existing discussions and issues.

[manniL]

Could you outline which use case(s) you had in mind? ☺️

[stafyniaksacha]

With https://github.com/nuxt-themes/starter we can imagine providing developers tools within the layouts
We also can imagine custom rendering methods for nuxt content (like drag and drop handlers in dev mode)