whisper.swiftui : add model download list & bench methods (#2546)

* swift : fix resources & exclude build

* whisper : impl whisper_timings struct & api

* whisper.swiftui : model list & bench methods

* whisper : return ptr for whisper_get_timings

* revert unnecessary change

* whisper : avoid designated initializer

* whisper.swiftui: code style changes

* whisper.swiftui : get device name / os from UIDevice

* whisper.swiftui : fix UIDevice usage

* whisper.swiftui : add memcpy and ggml_mul_mat (commented)

Package.swift

@@ -18,16 +18,17 @@ let package = Package(
             name: "whisper",
             path: ".",
             exclude: [
+               "build",
                "bindings",
                "cmake",
-               "coreml",
                "examples",
-               "extra",
+               "scripts",
                "models",
                "samples",
                "tests",
                "CMakeLists.txt",
-               "Makefile"
+               "Makefile",
+               "ggml/src/ggml-metal-embed.metal"
             ],
             sources: [
                 "ggml/src/ggml.c",
@@ -38,7 +39,7 @@ let package = Package(
                 "ggml/src/ggml-quants.c",
                 "ggml/src/ggml-metal.m"
             ],
-            resources: [.process("ggml-metal.metal")],
+            resources: [.process("ggml/src/ggml-metal.metal")],
             publicHeadersPath: "spm-headers",
             cSettings: [
                 .unsafeFlags(["-Wno-shorten-64-to-32", "-O3", "-DNDEBUG"]),