add archive_media configuration option

[fobser]

Styles and docs

• [x] I have read the contributing guide
• [x] I have run black on my code
• [ ] My tests are listed in alphabetical order

Tests

• [ ] I have added tests for this code in tests/test_ephemetoot.py
• [ ] I would like assistance to write the required tests
• [x] I don't know how to write test and would like someone to write them for me

The requests library doesn't support file:// URLs so I have no idea how to write a test for this. It seems inappropriate to to fetch a random URL from the internet in a test.

What this PR does

Changes in this pull request With the archive_media option set to true, media attachments are archived together with the toot.

Related issues

Resolves #72

[fobser]

Hi @hughrun I made the requested changes and force pushed my branch.

Thanks for handling the test, much appreciated. I had a look at the existing tests but kinda got lost.

[fobser]

Thanks, I'm @florian@bsd.network