Add experimental delta calculation and custom topology support

Cargo.toml

@@ -142,6 +142,10 @@ gitoxide-core-tools-archive = ["gitoxide-core/archive"]
 ## A sub-command to clean the worktree from untracked and ignored files.
 gitoxide-core-tools-clean = ["gitoxide-core/clean"]
 
+## A sub-command to create a pack with delta compression.
+## NOTE: This is an experimental feature and may change in the future.
+gitoxide-core-tools-delta-create = ["gitoxide-core/experimental-delta-create"]
+
 #! ### Building Blocks for mutually exclusive networking
 #! Blocking and async features are mutually exclusive and cause a compile-time error. This also means that `cargo … --all-features` will fail.
 #! Within each section, features can be combined.

gitoxide-core/Cargo.toml

@@ -47,6 +47,9 @@ async-client = ["gix/async-network-client-async-std", "gix-transport-configurati
 ## Data structures implement `serde::Serialize` and `serde::Deserialize`.
 serde = ["gix/serde", "dep:serde_json", "dep:serde", "bytesize/serde"]
 
+## The experimental ability to create a pack with delta compression.
+experimental-delta-create = ["gix-features", "dep:parking_lot"]
+
 [dependencies]
 # deselect everything else (like "performance") as this should be controllable by the parent application.
 gix = { version = "^0.83.0", path = "../gix", default-features = false, features = ["merge", "blob-diff", "blame", "revision", "mailmap", "excludes", "attributes", "worktree-mutation", "credentials", "interrupt", "status", "dirwalk"] }
@@ -94,6 +97,9 @@ tracing = { version = "0.1.43", optional = true }
 layout-rs = "0.1.3"
 open = "5.0.0"
 
+# for experimental delta create
+gix-features = { version = "^0.48.0", path = "../gix-features", default-features = false, features = ["crc32", "progress", "zlib"], optional = true }
+
 document-features = { version = "0.2.0", optional = true }
 
 [dev-dependencies]