composefs/export: Use ocidir for creating OCI compliant directory

Instead of handling the history,metadata,annotations ourselves, delegate
them to `ocidir` crate. Also take into account the source and target
image references

Finally call `skopeo::copy` to copy to containers-storage

Signed-off-by: Pragyan Poudyal <pragyanpoudyal41999@gmail.com>

Author: Johan-Liebert1

Cargo.lock

@@ -62,6 +62,7 @@ liboverdrop = "0.1.0"
 libsystemd = "0.7"
 linkme = "0.3"
 nom = "8.0.0"
+ocidir = "0.6.0"
 schemars = { version = "1.0.4", features = ["chrono04"] }
 serde_ignored = "0.1.10"
 serde_yaml = "0.9.34"