Update / expand meta-analysis demo

[dlebauer]

The web-based demo documentation/tutorials/02_Demo_Uncertainty_Analysis/Demo02.Rmd, included a meta-analysis step. Now that the PHP web interface is being deprecated, and the demo migrated to a notebook in #3570, there is no explanation or demonstration of the meta-analysis within a PEcAn workflow.

There were two reasons for this omission:

1. Simplicity and focus on the sensitivity analysis.
2. Running a meta-analysis independent of BETYdb is non-trivial because it relies on cross-table lookups to generate the trait-data.Rdata file used by the meta-analysis.

Currently there is a simple demonstration of a meta-analysis in modules/meta.analysis/vignettes/single.MA_demo.Rmd. This is a minimal example that focuses on the single.MA function but doesn't show how the meta-analysis is incorporated within a typical PEcAn workflow to constrain parameter priors.

This task should integrate concepts and content from both of the tutorials above to demonstrate the utility of using PEcAn meta-analysis tools to estimate parameter priors. The tutorial can skip the database and start with a trait-data.Rdata file or one could be constructed as part of the tutorial.

This could follow on the sensitivity analysis tutorial to show "now that you know the most sensitive parameters, lets do a targeted literature review to collect data to constrain one or two of these".

[AritraDey-Dev]

@dlebauer Would implementing a meta-analysis notebook similar to the Demo 1 and Demo 2 notebooks work? If so, I can go ahead and implement it. Having a .Rdata file beforehand should help with running the meta-analysis without requiring access to database.

[dlebauer]

@AritraDey-Dev yes that would be great, thanks!

[AritraDey-Dev]

Closed by #3707