add code to generate a mixed glossary from rOpenSci and Epiverse-TRACE

[avallecam]

This aims to mix current versions of rOpenSci and Epiverse-TRACE to translate a new episode.

This PR only includes an R script.

From this, we homogenize the online Epiverse-TRACE translation file for an easier downstream workflow:

• similar column names
• in duplicates, move the "agreed" entries on top to keep them with dplyr::distinct()

We avoided uploading the output mixed_glossary.csv since this is likely to change.

We initially generated the output file read-cases.Rmd, but then I was getting this output:

Error in `httr2::req_perform()`:
! HTTP 403 Forbidden.

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[avallecam]

Hi, @Bisaloo, I'm sharing this code here, but should we add it somewhere else to make it useful for any other tutorial repo? Like https://github.com/ropensci-review-tools/glossary If appropriate, let's better discuss it on GH discussions?

[Bisaloo]

I would likely turn this into functions and add them to https://github.com/epiverse-trace/etdev