Display the total size of a dataset on the dataset page

[TaniaSchlatter]

DataverseNL users (per @LauraHuisintveld in the community mailing list - https://groups.google.com/d/msg/dataverse-community/IN-ap31FcDU/H9S4C6poBQAJ) would like the total size of a dataset in on the dataset page. This is useful information when downloading all the files of a dataset at once.

This information is not currently included in the dataset redesign.
Somewhat related to:

• Download All Error Reporting - Hidden in Manifest if not all files are downloaded (4.9.4) #5588 Download all error reporting
• Make download all files feature more prominent #6118 Make download all files more prominent

Questions:

• What is our current state? We display file sizes. We capture the total byte size of the files.
• What can we know about download size? When can we know it?
• How might we display the size? Mockup options for position and formatting, depending on what we know about the size and how we know it.

Ideas:
The goal is to reduce incomplete downloads (the manifest solution), and move the warning earlier in the download experience.

1. @mheppler reminds that there my be previous mockups with a smart download button that keeps track of size of files selected, and/or number of files selected, and warns if/when "too large"
2. alternate is to provide info – show total on the page (top of table, for example) and warn if "too large"
3. alternate is to enable the download for larger size data, whenever a zip is generated. Related: Spike: investigate AWS lambda functions for zip file creation #6093. Depends on AWS, which not all installations are on.

[TaniaSchlatter]

Rough mockup that takes previous mock ups into account, and visualizes one solution to idea #2, above.

The difficult part of addressing this will be determining what the dataset size is – meaning what is included in the count of a dataset size (#6524).