Glide process image assets on upload

[jesseleite]

Closes statamic/ideas#485 Closes statamic/ideas#804 References statamic/ideas#300

• [x] Add new glide config to asset container edit form.
  • [x] Wire up new glide_source_preset config.
    • [x] Glide process images on upload.
    • [x] Fix error when uploading non-glideable filetypes.
    • [x] Hook up mark watermarking.
    • [x] Add test coverage.
  • [x] Wire up new glide_warm_presets config.
    • [x] Ensure user can save glide_warm_presets: false to disable intelligent warming.
    • [x] Glide configured warm presets on upload.
    • [x] Glide intelligently on upload when warm presets are not configured (everything except glide_source_preset).
    • [x] Glide configured warm presets when running pls glide:generate-presets.
    • [x] Add test coverage.
  • [x] Add new translatable strings to translation files.
  • [x] Documentation PR.
    • https://github.com/statamic/docs/pull/869