Feature/registry package index (#2623)

* include system images in compat s9pk

* wip

* wip

* update types

* wip

* fix signature serialization

* Add SignatureHeader conversions

* finish display impl for get

---------

Co-authored-by: Shadowy Super Coder <musashidisciple@proton.me>

core/Cargo.lock

@@ -1153,10 +1153,22 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f55bf8e7b65898637379c1b74eb1551107c8294ed26d855ceb9fd1a09cfc9bc0"
 dependencies = [
  "const-oid",
+ "der_derive",
  "pem-rfc7468",
  "zeroize",
 ]
 
+[[package]]
+name = "der_derive"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5fe87ce4529967e0ba1dcf8450bab64d97dfd5010a6256187ffe2e43e6f0e049"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.60",
+]
+
 [[package]]
 name = "deranged"
 version = "0.3.11"
@@ -4603,6 +4615,7 @@ dependencies = [
  "cookie 0.18.1",
  "cookie_store",
  "current_platform",
+ "der",
  "digest 0.10.7",
  "divrem",
  "ed25519 2.2.3",