incorporate power calculations for meta-analysis into baggr

[wwiecek]

Or maybe into the manuals. First compare with existing approaches:

• Calculating the Statistical Power of Studies Included in a Meta-Analysis Using {metameta}

• How to effortlessly calculate the statistical power of studies included in a meta-analysis

• How to calculate statistical power for your meta-analysis | by Dan Quintana | Towards Data Science

[wwiecek]

I reviewed this some time ago but thought it wasn't so worthwhile. But it would be good to have a second opinion in the form of a 1-page write-up on this issue, giving a sketch of an implementation if it feels worthwhile.