Allow an inline-only mode for DocRef attachments

[mikix]

User problem

I want to bulk export & archive DocumentReferences from my EHR while inlining attachments I know I'll care about in the future. This is both so that I have an archival record of the attachments I'm using right now and in case the EHR becomes unavailable in the future, I can still continue to refer back to the attachments.

However, I don't care about most mimetypes. I really only want html & text. PDFs, RTFs, etc will not be interesting to me, and will just take a long time to download.

Proposed fix

Instead of having the "inline attachment" logic be a subset of the "download attachment" logic, make them sibling paths. i.e. allow an inline-only mode where we don't bother download an attachment that is marked as a pdf in the FHIR record.

How would you like to see the user configuration for such a mode be done? (i.e. a new option like inlineOnly or re-use existing configuration and just start paying attention to inlineDocRefAttachmentsSmallerThan even if downloadAttachments is false?

I have some code that I'm testing for my own purposes to do this, and I can propose a PR later. But it will likely need some tweaking to fit your preferred configuration changes to allow for "inline only".