Rustic cleanups, dedups and making the code less hard to read in general (#251)

* typos :help_me:

* (part 1/?) massive cleanup to make the code more Rust-ic and cut down heap allocations.

* (part 2/?) massive cleanup to make the code more Rust-ic and cut down heap allocations.

* (part 3/?) cut down some pretty major heap allocations here - more Bytes and BytesMuts, less Vec<u8>s

also I don't really understand why you need to `to_vec` when you don't really use it again afterwards

* (part 4/?) deduplicate error handling in backblaze logic

* (part 5/?) fixes, cleanups, refactors, and reformatting

* (part 6/?) cleanups and refactors

* remove loads of `as_str` in types that already are `Display`

* Revert "remove loads of `as_str` in types that already are `Display`"

This reverts commit 4f974310cfb167ceba03001d81388db4f0fbb509.

* reformat and move routes util to the util module

* use streams

* Run prepare + formatting issues

Co-authored-by: Jai A <jaiagr+gpg@pm.me>
Co-authored-by: Geometrically <18202329+Geometrically@users.noreply.github.com>

src/util/ext.rs

@@ -1,20 +1,14 @@
 pub fn get_image_content_type(extension: &str) -> Option<&'static str> {
-    let content_type = match &*extension {
-        "bmp" => "image/bmp",
-        "gif" => "image/gif",
-        "jpeg" | "jpg" | "jpe" => "image/jpeg",
-        "png" => "image/png",
-        "svg" | "svgz" => "image/svg+xml",
-        "webp" => "image/webp",
-        "rgb" => "image/x-rgb",
-        "mp4" => "video/mp4",
-        _ => "",
-    };
-
-    if !content_type.is_empty() {
-        Some(content_type)
-    } else {
-        None
+    match extension {
+        "bmp" => Some("image/bmp"),
+        "gif" => Some("image/gif"),
+        "jpeg" | "jpg" | "jpe" => Some("image/jpeg"),
+        "png" => Some("image/png"),
+        "svg" | "svgz" => Some("image/svg+xml"),
+        "webp" => Some("image/webp"),
+        "rgb" => Some("image/x-rgb"),
+        "mp4" => Some("video/mp4"),
+        _ => None,
     }
 }