[stream_executor] NFC: Move stream library into a separate build target

PiperOrigin-RevId: 574756391

third_party/xla/xla/stream_executor/BUILD

@@ -449,6 +449,27 @@ cc_library(
     ],
 )
 
+cc_library(
+    name = "stream",
+    srcs = ["stream.cc"],
+    hdrs = ["stream.h"],
+    visibility = ["//visibility:public"],
+    deps = [
+        ":blas",
+        ":dnn",
+        ":stream_executor_headers",
+        ":stream_executor_pimpl",
+        "//xla/stream_executor/platform",
+        "@com_google_absl//absl/base:core_headers",
+        "@com_google_absl//absl/functional:any_invocable",
+        "@com_google_absl//absl/strings",
+        "@com_google_absl//absl/synchronization",
+        "@eigen_archive//:eigen3",
+        "@local_tsl//tsl/platform:logging",
+        "@local_tsl//tsl/platform:stacktrace",
+    ],
+)
+
 cc_library(
     name = "temporary_device_memory",
     srcs = ["temporary_device_memory.cc"],
@@ -532,10 +553,7 @@ cc_library(
 
 cc_library(
     name = "stream_executor_pimpl",
-    srcs = [
-        "stream.cc",
-        "stream_executor_pimpl.cc",
-    ],
+    srcs = ["stream_executor_pimpl.cc"],
     hdrs = ["stream_executor_pimpl.h"],
     visibility = ["//visibility:public"],
     deps = [
@@ -635,6 +653,7 @@ cc_library(
         ":multi_platform_manager",
         ":platform",
         ":scratch_allocator",
+        ":stream",
         ":stream_executor_headers",
         ":stream_executor_pimpl",
         ":temporary_device_memory",