WIP: Implement :unsubmodule

Change: unsubmodule

Author: christian-schilling

Cargo.lock

@@ -14,12 +14,14 @@ backtrace = "0.3.76"
 bitvec = "1.0.1"
 git-version = "0.3.9"
 git2 = { workspace = true }
+gix-submodule = "0.20.0"
 gix-object = "0.50.2"
 glob = "0.3.1"
 hex = { workspace = true }
 indoc = "2.0.7"
 itertools = "0.14.0"
 lazy_static = { workspace = true }
+toml = { workspace = true }
 log = { workspace = true }
 percent-encoding = "2.3.1"
 pest = "2.8.3"