Add support for S3-backed image storage

Cargo.toml

@@ -36,6 +36,9 @@ oauth2 = "4"
 csv = "1.2"
 sd-notify = "0.4.1"
 cron-parser = "0.10"
+image = { version = "0.25", default-features = false, features = ["jpeg", "png", "gif", "webp"] }
+nsfw = { version = "0.2", default-features = false }
+rust-s3 = { version = "0.38", default-features = false, features = ["tokio-rustls-tls"] }
 
 [dependencies.extract_derive]
 path = "extract_derive"