feat: added support for seeking in file streams

[gopal-panigrahi]

Adds support for range headers for seeking in streams

fixes #1048

[rien333]

Looks promising, tho I have yet to test this!

I've noticed that you've implemented seeking in your new handleFileContent, and not in handleUriContent.

While not technically required for this PR to work and be beneficial, I think it would be nice to support seeking when dealing with file URIs, too. Though then again, maybe that provides extra challenges.

For the record: Kore will currently go through the handleFileContent code path whenever files are shared from within Kore, but Kore will go through the handleUriContent path whenever Kore is asked to opened files from other apps (e.g. a music player or the photos app).

If you would implement seeking in handleUriContent one could, say, share a .mp3 from a music player app, and then seek within that file stream.

[gopal-panigrahi]

Understood, I’ll look into handling it for shared media as well. I wasn’t aware of the share feature, thanks for pointing it out.

[gopal-panigrahi]

@rien333, I have tried adding seek support for uri content too. Maybe you can try and let me know if there is any usecase left.

[rien333]

Think you covered everything! Will not have any time available to test until mid november, tho.