Revert the Metal Experiment (#701)

Metal sounded like a good idea to get in the emulator but frankly I
underestimated just how experimental and not ready it was.
From my write up in the Discord:
```
As is, Metal supports only a few games.
The games it does support freeze on first use of not playing them via Vulkan, because shader translation is broken.
So you need to use a dirty hack to not delete all your shaders.
Not to mention it breaks many games via MoltenVK because of changes to the shared GPU code.

Merging Metal seemed like a great idea, because of the few games it does support.
But I don't think it's worth it. Many of the games it breaks via MoltenVK *don't work via Metal*. 
Which effectively makes current Ryubing worse for Mac users than Ryujinx 1.1.1403.

I think what I'm gonna do is revert Metal, and reopen it as a PR. That way, you can still take advantage of the Metal backend as is, but without making other games worse with no solution.
```

For what it's worth, the shader translation part could at least be
"fixed" by always applying a 30ms delay for shader translation to Metal.
That being said, that solution sucks ass.
The MoltenVK regressions are even worse.



I hope this is not a let down to the Mac users. I hope you realize I'm
reverting this because you're actively getting a worse experience with
it in the emulator.

src/Ryujinx.Graphics.Metal/HardwareInfo.cs

@@ -1,82 +0,0 @@
-using System;
-using System.Runtime.InteropServices;
-
-namespace Ryujinx.Graphics.Metal
-{
-    static partial class HardwareInfoTools
-    {
-
-        private readonly static IntPtr _kCFAllocatorDefault = IntPtr.Zero;
-        private readonly static UInt32 _kCFStringEncodingASCII = 0x0600;
-        private const string IOKit = "/System/Library/Frameworks/IOKit.framework/IOKit";
-        private const string CoreFoundation = "/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation";
-
-        [LibraryImport(IOKit, StringMarshalling = StringMarshalling.Utf8)]
-        private static partial IntPtr IOServiceMatching(string name);
-
-        [LibraryImport(IOKit)]
-        private static partial IntPtr IOServiceGetMatchingService(IntPtr mainPort, IntPtr matching);
-
-        [LibraryImport(IOKit)]
-        private static partial IntPtr IORegistryEntryCreateCFProperty(IntPtr entry, IntPtr key, IntPtr allocator, UInt32 options);
-
-        [LibraryImport(CoreFoundation, StringMarshalling = StringMarshalling.Utf8)]
-        private static partial IntPtr CFStringCreateWithCString(IntPtr allocator, string cString, UInt32 encoding);
-
-        [LibraryImport(CoreFoundation)]
-        [return: MarshalAs(UnmanagedType.U1)]
-        public static partial bool CFStringGetCString(IntPtr theString, IntPtr buffer, long bufferSizes, UInt32 encoding);
-
-        [LibraryImport(CoreFoundation)]
-        public static partial IntPtr CFDataGetBytePtr(IntPtr theData);
-
-        static string GetNameFromId(uint id)
-        {
-            return id switch
-            {
-                0x1002 => "AMD",
-                0x106B => "Apple",
-                0x10DE => "NVIDIA",
-                0x13B5 => "ARM",
-                0x8086 => "Intel",
-                _ => $"0x{id:X}"
-            };
-        }
-
-        public static string GetVendor()
-        {
-            IntPtr serviceDict = IOServiceMatching("IOGPU");
-            IntPtr service = IOServiceGetMatchingService(IntPtr.Zero, serviceDict);
-            IntPtr cfString = CFStringCreateWithCString(_kCFAllocatorDefault, "vendor-id", _kCFStringEncodingASCII);
-            IntPtr cfProperty = IORegistryEntryCreateCFProperty(service, cfString, _kCFAllocatorDefault, 0);
-
-            byte[] buffer = new byte[4];
-            IntPtr bufferPtr = CFDataGetBytePtr(cfProperty);
-            Marshal.Copy(bufferPtr, buffer, 0, buffer.Length);
-
-            uint vendorId = BitConverter.ToUInt32(buffer);
-
-            return GetNameFromId(vendorId);
-        }
-
-        public static string GetModel()
-        {
-            IntPtr serviceDict = IOServiceMatching("IOGPU");
-            IntPtr service = IOServiceGetMatchingService(IntPtr.Zero, serviceDict);
-            IntPtr cfString = CFStringCreateWithCString(_kCFAllocatorDefault, "model", _kCFStringEncodingASCII);
-            IntPtr cfProperty = IORegistryEntryCreateCFProperty(service, cfString, _kCFAllocatorDefault, 0);
-
-            char[] buffer = new char[64];
-            IntPtr bufferPtr = Marshal.AllocHGlobal(buffer.Length);
-
-            if (CFStringGetCString(cfProperty, bufferPtr, buffer.Length, _kCFStringEncodingASCII))
-            {
-                string model = Marshal.PtrToStringUTF8(bufferPtr);
-                Marshal.FreeHGlobal(bufferPtr);
-                return model;
-            }
-
-            return string.Empty;
-        }
-    }
-}