Add copyright notices and license identifiers (#3660)

Adds copyright notices and SPDX license identifiers to

* CMake files
* Python and bash scripts
* C, C++ and HIP code
* GitHub actions/workflows

Strips the full licenses where they have been provided in-line.
Preexisting copyright notices and license identifiers are not modified.

Closes #200.

Author: marbre

.github/actions/setup_test_environment/action.yml

@@ -1,3 +1,6 @@
+# Copyright Advanced Micro Devices, Inc.
+# SPDX-License-Identifier: MIT
+
 name: "Setup test environment"
 
 description: Setup ROCm test environment from built artifacts

.github/workflows/build_linux_jax_wheels.yml

@@ -1,3 +1,6 @@
+# Copyright Advanced Micro Devices, Inc.
+# SPDX-License-Identifier: MIT
+
 name: Build Portable Linux JAX Wheels
 
 on:

.github/workflows/build_native_linux_packages.yml

@@ -1,3 +1,6 @@
+# Copyright Advanced Micro Devices, Inc.
+# SPDX-License-Identifier: MIT
+
 name: Build Native Linux Packages
 
 on:

.github/workflows/build_portable_linux_artifacts.yml

@@ -1,3 +1,6 @@
+# Copyright Advanced Micro Devices, Inc.
+# SPDX-License-Identifier: MIT
+
 name: Build Portable Linux Artifacts
 
 on:

.github/workflows/build_portable_linux_python_packages.yml

@@ -1,3 +1,6 @@
+# Copyright Advanced Micro Devices, Inc.
+# SPDX-License-Identifier: MIT
+
 name: Build Portable Linux Python Packages
 
 on:

.github/workflows/build_portable_linux_pytorch_wheels.yml

@@ -1,3 +1,6 @@
+# Copyright Advanced Micro Devices, Inc.
+# SPDX-License-Identifier: MIT
+
 name: Build Portable Linux PyTorch Wheels
 
 on:

.github/workflows/build_portable_linux_pytorch_wheels_ci.yml

@@ -1,3 +1,6 @@
+# Copyright Advanced Micro Devices, Inc.
+# SPDX-License-Identifier: MIT
+
 # CI variant of build_portable_linux_pytorch_wheels.yml.
 #
 # Key differences from the release workflow:

.github/workflows/build_windows_artifacts.yml

@@ -1,3 +1,6 @@
+# Copyright Advanced Micro Devices, Inc.
+# SPDX-License-Identifier: MIT
+
 name: Build Windows Artifacts
 
 on:

.github/workflows/build_windows_python_packages.yml

@@ -1,3 +1,6 @@
+# Copyright Advanced Micro Devices, Inc.
+# SPDX-License-Identifier: MIT
+
 name: Build Windows Python Packages
 
 on:

.github/workflows/build_windows_pytorch_wheels.yml

@@ -1,3 +1,6 @@
+# Copyright Advanced Micro Devices, Inc.
+# SPDX-License-Identifier: MIT
+
 name: Build Windows PyTorch Wheels
 
 on: