Migrate 25 crates to monorepo.

sec1
semver
serde_cbor
serde_derive
shared_library
slab
smallvec
smccc
socket2
spin
spki
strsim
strum
strum_macros
sync_wrapper
syn-mid
synstructure
tempfile
termcolor
termtree
textwrap
thiserror
thread_local
tinytemplate
tokio-macros

Bug: 339424309
Test: treehugger
Change-Id: Ic996a9fa8daf427c295dcc41ef08291723edd3b9

Android.bp

diff --git a/Android.bp b/Android.bp
index d9ac9f5..96beb97 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,32 +1 @@
-// This file is generated by cargo_embargo.
-// Do not modify this file because the changes will be overridden on upgrade.
-
-package {
-    default_applicable_licenses: ["external_rust_crates_socket2_license"],
-}
-
-license {
-    name: "external_rust_crates_socket2_license",
-    visibility: [":__subpackages__"],
-    license_kinds: ["SPDX-license-identifier-Apache-2.0"],
-    license_text: ["LICENSE"],
-}
-
-rust_library {
-    name: "libsocket2",
-    host_supported: true,
-    crate_name: "socket2",
-    cargo_env_compat: true,
-    cargo_pkg_version: "0.5.5",
-    crate_root: "src/lib.rs",
-    edition: "2021",
-    features: ["all"],
-    rustlibs: ["liblibc"],
-    apex_available: [
-        "//apex_available:platform",
-        "//apex_available:anyapex",
-    ],
-    product_available: true,
-    vendor_available: true,
-    min_sdk_version: "29",
-}
+// This crate has been migrated to external/rust/android-crates-io.

TEST_MAPPING

diff --git a/TEST_MAPPING b/TEST_MAPPING
deleted file mode 100644
index a32d61c..0000000
--- a/TEST_MAPPING
+++ /dev/null
@@ -1,29 +0,0 @@
-// Generated by update_crate_tests.py for tests that depend on this crate.
-{
-  "imports": [
-    {
-      "path": "external/rust/crates/async-stream"
-    },
-    {
-      "path": "external/rust/crates/futures-util"
-    },
-    {
-      "path": "external/rust/crates/tokio"
-    },
-    {
-      "path": "external/rust/crates/tokio-test"
-    },
-    {
-      "path": "external/uwb/src"
-    },
-    {
-      "path": "packages/modules/DnsResolver"
-    },
-    {
-      "path": "system/security/keystore2"
-    },
-    {
-      "path": "system/security/keystore2/legacykeystore"
-    }
-  ]
-}

cargo_embargo.json

diff --git a/cargo_embargo.json b/cargo_embargo.json
deleted file mode 100644
index bc82b96..0000000
--- a/cargo_embargo.json
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "features": [
-    "all"
-  ],
-  "min_sdk_version": "29",
-  "run_cargo": false
-}