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>

pbs-tools/Cargo.toml

@@ -28,6 +28,7 @@ serde_json = "1.0"
 tokio = { version = "1.6", features = [ "fs", "io-util", "rt", "rt-multi-thread", "sync" ] }
 url = "2.1"
 walkdir = "2"
+zstd = { version = "0.6", features = [ "bindgen" ] }
 
 proxmox = { version = "0.13.0", default-features = false, features = [ "tokio" ] }