Add dependency on `itertools` to `fj-kernel`

Cargo.lock

@@ -1187,6 +1187,7 @@ dependencies = [
  "anyhow",
  "fj-interop",
  "fj-math",
+ "itertools",
  "parking_lot",
  "pretty_assertions",
  "robust-predicates",
@@ -1836,6 +1837,15 @@ version = "2.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f88c5561171189e69df9d98bcf18fd5f9558300f7ea7b801eb8a0fd748bd8745"
 
+[[package]]
+name = "itertools"
+version = "0.10.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0fd2260e829bddf4cb6ea802289de2f86d6a7a690192fbe91b3f46e0f2c8473"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "itoa"
 version = "1.0.4"

crates/fj-kernel/Cargo.toml

@@ -13,6 +13,7 @@ categories.workspace = true
 [dependencies]
 fj-interop.workspace = true
 fj-math.workspace = true
+itertools = "0.10.5"
 parking_lot = "0.12.0"
 pretty_assertions = "1.3.0"
 robust-predicates = "0.1.4"