Use scap library to implement screensharing on X11 (#27807)

While `scap` does have support for Wayland and Windows, but haven't seen
screensharing work properly there yet. So for now just adding support
for X11 screensharing.

WIP branches for enabling wayland and windows support:

* https://github.com/zed-industries/zed/tree/wayland-screenshare
* https://github.com/zed-industries/zed/tree/windows-screenshare


Release Notes:

- Added support for screensharing on X11 (Linux)

---------

Co-authored-by: Conrad <conrad@zed.dev>
Co-authored-by: Mikayla <mikayla@zed.dev>
Co-authored-by: Junkui Zhang <364772080@qq.com>

script/linux

@@ -28,6 +28,7 @@ if [[ -n $apt ]]; then
     libasound2-dev
     libfontconfig-dev
     libwayland-dev
+    libx11-xcb-dev
     libxkbcommon-x11-dev
     libssl-dev
     libzstd-dev
@@ -76,6 +77,7 @@ if [[ -n $dnf ]] || [[ -n $yum ]]; then
     alsa-lib-devel
     fontconfig-devel
     wayland-devel
+    libxcb-devel
     libxkbcommon-x11-devel
     openssl-devel
     libzstd-devel
@@ -144,6 +146,7 @@ if [[ -n $zyp ]]; then
     gzip
     jq
     libvulkan1
+    libxcb-devel
     libxkbcommon-devel
     libxkbcommon-x11-devel
     libzstd-devel
@@ -174,6 +177,7 @@ if [[ -n $pacman ]]; then
     fontconfig
     wayland
     libgit2
+    libxcb
     libxkbcommon-x11
     openbsd-netcat
     openssl