workspace: add Rust EFI infrastructure

This bumps rules_rust, cleans up the toolchains with the new version.
It also adds the Prost codegen to "normal" crate set as well as a new
crate set specific to EFI. This is separate because of Rust no-std's
dependence on create feature tags.

Change-Id: Ie76e66ee83696948391420ca3b011a3a71258690
Reviewed-on: https://review.monogon.dev/c/monogon/+/2202
Tested-by: Jenkins CI
Reviewed-by: Serge Bazanski <serge@monogon.tech>
diff --git a/third_party/rust/cargo/remote/BUILD.unicode-ident-1.0.12.bazel b/third_party/rust/cargo/remote/BUILD.unicode-ident-1.0.12.bazel
new file mode 100644
index 0000000..b015ee8
--- /dev/null
+++ b/third_party/rust/cargo/remote/BUILD.unicode-ident-1.0.12.bazel
@@ -0,0 +1,58 @@
+"""
+@generated
+cargo-raze crate build file.
+
+DO NOT EDIT! Replaced on runs of cargo-raze
+"""
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+# buildifier: disable=load
+load(
+    "@rules_rust//rust:defs.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_proc_macro",
+    "rust_test",
+)
+
+package(default_visibility = [
+    # Public for visibility by "@raze__crate__version//" targets.
+    #
+    # Prefer access through "//third_party/rust/cargo", which limits external
+    # visibility to explicit Cargo.toml dependencies.
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # MIT from expression "(MIT OR Apache-2.0) AND Unicode-DFS-2016"
+])
+
+# Generated Targets
+
+# Unsupported target "xid" with type "bench" omitted
+
+rust_library(
+    name = "unicode_ident",
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    data = [],
+    edition = "2018",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    tags = [
+        "cargo-raze",
+        "crate-name=unicode-ident",
+        "manual",
+    ],
+    version = "1.0.12",
+    # buildifier: leave-alone
+    deps = [
+    ],
+)
+
+# Unsupported target "compare" with type "test" omitted
+
+# Unsupported target "static_size" with type "test" omitted