split proxmox-file-restore into its own crate

This also moves a couple of required utilities such as
logrotate and some file descriptor methods to pbs-tools.

Note that the logrotate usage and run-dir handling should be
improved to work as a regular user as this *should* (IMHO)
be a regular unprivileged command (including running
qemu given the kvm privileges...)

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

Cargo.toml

@@ -31,6 +31,7 @@ members = [
     "proxmox-backup-banner",
     "proxmox-backup-client",
     "proxmox-backup-debug",
+    "proxmox-file-restore",
     "pxar-bin",
 ]
 
@@ -83,7 +84,6 @@ url = "2.1"
 walkdir = "2"
 webauthn-rs = "0.2.5"
 xdg = "2.2"
-zstd = { version = "0.6", features = [ "bindgen" ] }
 nom = "5.1"
 crossbeam-channel = "0.5"