feat: allow direct pdf archives

[fmartingr]

This pull request aims to provide PDF archives for bookmarks by directly downloading the file.

Notable changes

• Logic for archivers now uses the ArchiverDomain
  • ArchiverDomain initializes a list of archivers that try to match the content type, if it does, that archiver is used. If an error is raised, the next archiver is used and so on.
• Added PDFArchiver: Just downloads the file.
• Added WARCArchiver as a "catch all" (current default)
• Added database columns bookmark.archiver (warc/pdf) and archive_path.
  • Bookmark has an archive if archive_path != ""

Pending

• Migrate the archive_path for existing bookmarks: iterate over the bookmarks, check if the archive exists and set the path and the archiver to warc.
• Refactor EPub logic separate from the archiver
• Allow different archivers in archive page
• Tests
• e2e tests?

Closes #929

[codecov]

Codecov Report

Attention: Patch coverage is 43.26923% with 236 lines in your changes missing coverage. Please review.

Project coverage is 35.59%. Comparing base (617f5dd) to head (ddbac3c).

Files with missing lines	Patch %	Lines
...ernal/database/migrations/0001_migrate_archiver.go	37.07%	54 Missing and 2 partials ⚠️
internal/domains/archiver.go	11.76%	45 Missing ⚠️
internal/archiver/pdf.go	12.50%	28 Missing ⚠️
internal/webserver/handler-api-ext.go	0.00%	27 Missing ⚠️
internal/http/routes/api/v1/bookmarks.go	0.00%	19 Missing ⚠️
internal/domains/storage.go	0.00%	17 Missing ⚠️
internal/archiver/warc.go	63.41%	10 Missing and 5 partials ⚠️
internal/webserver/handler-api.go	0.00%	11 Missing ⚠️
internal/cmd/add.go	0.00%	10 Missing ⚠️
internal/model/archiver.go	88.57%	4 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #942      +/-   ##
==========================================
+ Coverage   34.74%   35.59%   +0.85%     
==========================================
  Files          61       65       +4     
  Lines        5322     5557     +235     
==========================================
+ Hits         1849     1978     +129     
- Misses       3249     3349     +100     
- Partials      224      230       +6     

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