Request: Add Debug build mode

Thre are some declarations of build mode in the setup_env.py scritpt.
Hence, I suggest adding the following code in it.

Additional argument

Target: https://github.com/microsoft/BitNet/blob/caf17ec438808bcf9b3da012216c8624a29b8cdc/setup_env.py#L205

parser.add_argument("--build-mode", type=str, choices=["Release", "Debug"], default="Debug", help="Build mode of source")

Compiler extra debug args

COMPILER_EXTRA_DEBUG_ARGS = {
    "arm64": ["-DBITNET_ARM_TL1=ON", "-DCMAKE_BUILD_TYPE=Debug"],
    "x86_64": ["-DBITNET_X86_TL2=ON", "-DCMAKE_BUILD_TYPE=Debug"]
}

Additional build process

Target

https://github.com/microsoft/BitNet/blob/caf17ec438808bcf9b3da012216c8624a29b8cdc/setup_env.py#L184

if args.build-mode == "Release":
    run_command(["cmake", "-B", "build", *COMPILER_EXTRA_ARGS[arch], *OS_EXTRA_ARGS.get(platform.system(), [])], log_step="generate_build_files")
    run_command(["cmake", "--build", "build", "--config", "Release"], log_step="compile")
else:
    run_command(["cmake", "-B", "build", *COMPILER_EXTRA_DEBUG_ARGS[arch], *OS_EXTRA_ARGS.get(platform.system(), [])], log_step="generate_build_files")
    run_command(["cmake", "--build", "build", "--config", "Debug"], log_step="compile")

Inspect setup_env.py around the build process near line 184 and argument parsing near line 205. Review the existing compiler arguments and CMake invocations, then verify that selecting Release or Debug generates and builds the corresponding configuration for the supported architectures.