[FEATURE] Propagate more metadata to the index

2) can you propagate more metadata to the index -- particularly size of download.

Originally posted by @vjcitn in https://github.com/Bioconductor/Contributions/issues/3064#issuecomment-1565308647

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Context

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link to raw code, example: https://github.com/lcolladotor/osca_LIIGH_UNAM_2020/blob/master/00-template.Rmd#L24-L28
link to a commit, example: https://github.com/lcolladotor/osca_LIIGH_UNAM_2020/commit/6aa30b22eda614d932c12997ba611ba582c435d7
link to a line of code inside a commit, example: https://github.com/lcolladotor/osca_LIIGH_UNAM_2020/commit/6aa30b22eda614d932c12997ba611ba582c435d7#diff-e265269fe4f17929940e81341b92b116R17
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Code

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## prompt an error
stop('hola')

## check the error trace
traceback()

Small reproducible example

If you copy the lines of code that lead to your error, you can then run reprex::reprex() which will create a small website with code you can then easily copy-paste here in a way that will be easy to work with later on.

## prompt an error
stop('hola')
#> Error in eval(expr, envir, enclos): hola

## check the error trace
traceback()
#> No traceback available

R session information

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options(width = 120)
sessioninfo::session_info()

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iSEE / iSEEindex