Add cgo implementation for llama.cpp

Run the server.cpp directly inside the Go runtime via cgo
while retaining the LLM Go abstractions.

llm/llama.cpp/gen_windows.ps1

@@ -0,0 +1,51 @@
+#!powershell
+
+$ErrorActionPreference = "Stop"
+
+function init_vars {
+    $script:buildDir="gguf/build/wincuda"
+    $script:installDir="gguf/build/wincuda/dist"
+    $script:patches = @("0001-Expose-callable-API-for-server.patch")
+    $script:cmakeDefs = @("-DLLAMA_NATIVE=off", "-DLLAMA_F16C=off", "-DLLAMA_FMA=off", "-DLLAMA_AVX512=off", "-DLLAMA_AVX2=off", "-DLLAMA_AVX=on", "-DLLAMA_K_QUANTS=on", "-DLLAMA_ACCELERATE=on", "-DLLAMA_CUBLAS=ON","-DCMAKE_VERBOSE_MAKEFILE=ON","-DBUILD_SHARED_LIBS=on","-A","x64")
+
+    if ($env:CGO_CFLAGS -contains "-g") {
+        $script:cmakeDefs += @("-DCMAKE_VERBOSE_MAKEFILE=on")
+        $script:config += "RelWithDebInfo"
+    } else {
+        $script:config += "Release"
+    }
+}
+
+function git_module_setup {
+    # TODO add flags to skip the init/patch logic to make it easier to mod llama.cpp code in-repo
+    & git submodule init
+    & git submodule update --force gguf
+}
+
+function apply_patches {
+    rm -erroraction ignore -path "gguf/examples/server/server.h"
+    foreach ($patch in $patches) {
+        write-host "Applying patch $patch"
+        & git -C gguf apply ../patches/$patch
+    }
+}
+
+function build {
+    write-host "generating config with: cmake -S gguf -B $buildDir $cmakeDefs"
+    & cmake --version
+    & cmake -S gguf -B $buildDir $cmakeDefs
+    write-host "building with: cmake --build $buildDir --config $config"
+    & cmake --build $buildDir --config $config
+}
+
+function install {
+    rm -erroraction ignore -recurse -force -path $installDir
+    & cmake --install $buildDir --prefix $installDir --config $config
+
+}
+
+init_vars
+git_module_setup
+apply_patches
+build
+install