Add vetiver_dashboard template and function

[juliasilge]

This PR adds a new dashboard for model monitoring. This includes an output format (vetiver_dashboard()) and an R Markdown template.

[juliasilge]

Closes #5

[juliasilge]

Closes #103

Thank you so much @cderv! 🙏

[juliasilge]

TODO:

• The pin URL doesn't seem to be working
• Make a better error if the pin doesn't exist and the user tries to knit the dashboard

[cderv]

I think I missed something important that we need to rediscuss. Please see my comment below.

[cderv]

Ok I think I have missed something important.

pins <- get_vetiver_dashboard_pins()

This will work well during knitting only and not interactively as the knitr option knitr::opts_knit$get("vetiver_dashboard.pins") won't be populated by the IDE - it will only be populated when the document is knitted and vetiver::vetiver_dashboard() is effectively evaluated.

This may not be what you wanted considering that is was working as expected for you using params. Am I right ?

Sorry for the oversight on this. The RStudio IDE in fact do a specific processing of the YAML params fields to make it available in the global environment for interactive execution of chunk.

So we probably need to reconsider the current solution, aren't we ?

[cderv]

See my comment above, this will return a non-NULL value only during knitting. In interactive mode (without rendering the all doc but running chunk by chunk), the knitr options won't be populated.

I'll probably need to find another solution as you may not want this behavior.