added metadata to more facets: time_agg, grid_label, realm.

[antarcticrainforest]

@eelucio what does this do?

[eelucio]

it shows the metadata information for these facet values, in case someone is interested or wants to search them via webbrowser (similar to fs_type posix what it is)

I found it useful specially for the time_aggregation and grid_types, and I added several institution info.

I guess that 99% could be achieved crawling, but since I had the cmip6 tables opened may as well use their info ...

[antarcticrainforest]

LGTM!