Linux: Rewrite the event loop using calloop (#8314)

This PR unifies the event loop code for Wayland and X11. On Wayland,
blocking dispatch is now used. On X11, the invisible window is no longer
needed.

Release Notes:

- N/A

---------

Co-authored-by: Dzmitry Malyshau <kvark@fastmail.com>
Co-authored-by: Tadeo Kondrak <me@tadeo.ca>
Co-authored-by: Mikayla Maki <mikayla@zed.dev>
Co-authored-by: julia <julia@zed.dev>

Cargo.lock

@@ -1631,6 +1631,32 @@ dependencies = [
  "util",
 ]
 
+[[package]]
+name = "calloop"
+version = "0.12.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fba7adb4dd5aa98e5553510223000e7148f621165ec5f9acd7113f6ca4995298"
+dependencies = [
+ "bitflags 2.4.1",
+ "log",
+ "polling 3.3.2",
+ "rustix 0.38.30",
+ "slab",
+ "thiserror",
+]
+
+[[package]]
+name = "calloop-wayland-source"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0f0ea9b9476c7fad82841a8dbb380e2eae480c21910feba80725b46931ed8f02"
+dependencies = [
+ "calloop",
+ "rustix 0.38.30",
+ "wayland-backend",
+ "wayland-client",
+]
+
 [[package]]
 name = "castaway"
 version = "0.1.2"
@@ -4002,6 +4028,8 @@ dependencies = [
  "blade-macros",
  "block",
  "bytemuck",
+ "calloop",
+ "calloop-wayland-source",
  "cbindgen",
  "cocoa",
  "collections",