feat: add back Temporal support (#1840)

Fixes #1839

I needed to patch temporal_capi to depend on temporal_rs 0.0.11 exactly: https://crates.io/crates/ry_temporal_capi/0.0.11-ry.1

---------

Co-authored-by: snek <the@snek.dev>

Author: ry

.gitignore

@@ -12,3 +12,4 @@ third_party/android_ndk
 third_party/android_platform
 third_party/catapult
 third_party/llvm-build
+third_party/rust-toolchain

.gitmodules

@@ -52,3 +52,6 @@
 [submodule "third_party/dragonbox/src"]
 	path = third_party/dragonbox/src
 	url = https://chromium.googlesource.com/external/github.com/jk-jeon/dragonbox.git
+[submodule "third_party/rust"]
+	path = third_party/rust
+	url = https://chromium.googlesource.com/chromium/src/third_party/rust

.gn

@@ -99,8 +99,9 @@ default_args = {
   # TODO: third_party/compiler-rt missing?
   use_llvm_libatomic = false
 
-  # TODO: wants to download rust nightly toolchain from GCS
-  v8_enable_temporal_support = false
+  enable_rust = true
+  enable_rust_cxx = true
+  v8_enable_temporal_support = true
 
   # prevent hashdos
   v8_use_default_hasher_secret = false