[reorg] move xds code to src/core/xds (#36521)

Also do some cleanup in CODEOWNERS.

Closes #36521

PiperOrigin-RevId: 631137895

.github/CODEOWNERS

@@ -1,11 +1,12 @@
-/**/OWNERS @markdroth @a11r
 /bazel/** @veblush @gnossen
 /bazel/experiments.yaml
 /cmake/** @veblush @apolcyn
-/src/core/ext/filters/client_channel/** @markdroth
+/src/core/client_channel/** @markdroth
 /src/core/ext/transport/chttp2/transport/** @ctiller
-/src/core/ext/xds/** @markdroth
-/src/core/lib/resolver/** @markdroth
-/src/core/lib/service_config/** @markdroth
+/src/core/load_balancing/** @markdroth
+/src/core/resolver/** @markdroth
+/src/core/server/xds* @markdroth
+/src/core/service_config/** @markdroth
+/src/core/xds/** @markdroth
 /tools/dockerfile/** @drfloob @apolcyn @gnossen
 /tools/run_tests/xds_k8s_test_driver/** @sergiitk @XuanWang-Amos @gnossen

BUILD

@@ -4317,21 +4317,21 @@ grpc_cc_library(
 grpc_cc_library(
     name = "xds_client",
     srcs = [
-        "//src/core:ext/xds/xds_api.cc",
-        "//src/core:ext/xds/xds_bootstrap.cc",
-        "//src/core:ext/xds/xds_client.cc",
-        "//src/core:ext/xds/xds_client_stats.cc",
+        "//src/core:xds/xds_client/xds_api.cc",
+        "//src/core:xds/xds_client/xds_bootstrap.cc",
+        "//src/core:xds/xds_client/xds_client.cc",
+        "//src/core:xds/xds_client/xds_client_stats.cc",
     ],
     hdrs = [
-        "//src/core:ext/xds/xds_api.h",
-        "//src/core:ext/xds/xds_bootstrap.h",
-        "//src/core:ext/xds/xds_channel_args.h",
-        "//src/core:ext/xds/xds_client.h",
-        "//src/core:ext/xds/xds_client_stats.h",
-        "//src/core:ext/xds/xds_metrics.h",
-        "//src/core:ext/xds/xds_resource_type.h",
-        "//src/core:ext/xds/xds_resource_type_impl.h",
-        "//src/core:ext/xds/xds_transport.h",
+        "//src/core:xds/xds_client/xds_api.h",
+        "//src/core:xds/xds_client/xds_bootstrap.h",
+        "//src/core:xds/xds_client/xds_channel_args.h",
+        "//src/core:xds/xds_client/xds_client.h",
+        "//src/core:xds/xds_client/xds_client_stats.h",
+        "//src/core:xds/xds_client/xds_metrics.h",
+        "//src/core:xds/xds_client/xds_resource_type.h",
+        "//src/core:xds/xds_client/xds_resource_type_impl.h",
+        "//src/core:xds/xds_client/xds_transport.h",
     ],
     external_deps = [
         "absl/base:core_headers",