linux(x11): Add support for pasting images from clipboard (#29387)

Closes:
https://github.com/zed-industries/zed/pull/29177#issuecomment-2823359242

Removes dependency on
[quininer/x11-clipboard](https://github.com/quininer/x11-clipboard) as
it is in [maintenance
mode](https://github.com/quininer/x11-clipboard/issues/19).

X11 clipboard functionality is now built-in to GPUI which was
accomplished by stripping the non-x11-related code/abstractions from
[1Password/arboard](https://github.com/1Password/arboard) and extending
it to support all image formats already supported by GPUI on wayland and
macos.

A benefit of switching over to the `arboard` implementation, is that we
now make an attempt to have an X11 "clipboard manager" (if available -
something the user has to setup themselves) save the contents of
clipboard (if the last copy operation was within Zed) so that the copied
contents can still be pasted once Zed has completely stopped.

Release Notes:

- Linux(X11): Add support for pasting images from clipboard

crates/gpui/src/platform.rs

@@ -1479,6 +1479,21 @@ pub enum ImageFormat {
     Tiff,
 }
 
+impl ImageFormat {
+    /// Returns the mime type for the ImageFormat
+    pub const fn mime_type(self) -> &'static str {
+        match self {
+            ImageFormat::Png => "image/png",
+            ImageFormat::Jpeg => "image/jpeg",
+            ImageFormat::Webp => "image/webp",
+            ImageFormat::Gif => "image/gif",
+            ImageFormat::Svg => "image/svg+xml",
+            ImageFormat::Bmp => "image/bmp",
+            ImageFormat::Tiff => "image/tiff",
+        }
+    }
+}
+
 /// An image, with a format and certain bytes
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub struct Image {