Preserve metadata with zip archives

[Aariq]

This closes #58 and supersedes #63 and #106.

Adds a preserve_metadata argument to tar_terra_rast() that when TRUE switches the write and read functions to write to a tempdir and zip files before moving them to path and to unzip that archive before reading in with terra::rast(). This is a blanket solution (I think) that should work for any raster driver. There are notes as to why vsizip/ wasn't used in notes/

Question for reviewers:
Should terra, zip, and withr still be in Suggests? Now that it's more clear the main utility of geotargets is to work with terra, we might consider moving it (and the dependencies needed for preserve_metadata) into Imports

[njtierney]

This looks great! As mentioned in the review, I think it might be useful/worthwhile to consider using enum / character option instead of TRUE/FALSE for preserve_metadata, as discussed in https://design.tidyverse.org/boolean-strategies.html.

Re

Question for reviewers:
Should terra, zip, and withr still be in Suggests? Now that it's more clear the main utility of geotargets is to work with terra, we might consider moving it (and the dependencies needed for preserve_metadata) into Imports

I agree with you at terra, zip, and withrshould be in Imports now, especially since it is more or less the main goal ofgeotargetsto work withterra` - which we didn't know for sure would be the case when we started the project.

[Aariq]

Ok, I've got the geotargets option for preserve metadata worked out, if anyone wants to give feedback on naming things.

[njtierney]

Looks awesome!

Just some small changes! Not sure if the switch statement is necessary, but it might be useful, maybe?

[njtierney]

Looks good to me, thanks so much, @Aariq !