IPC refactor part 3+4: New server HIPC message processor (#4188)

* IPC refactor part 3 + 4: New server HIPC message processor with source generator based serialization

* Make types match on calls to AlignUp/AlignDown

* Formatting

* Address some PR feedback

* Move BitfieldExtensions to Ryujinx.Common.Utilities and consolidate implementations

* Rename Reader/Writer to SpanReader/SpanWriter and move to Ryujinx.Common.Memory

* Implement EventType

* Address more PR feedback

* Log request processing errors since they are not normal

* Rename waitable to multiwait and add missing lock

* PR feedback

* Ac_K PR feedback

Ryujinx.Horizon/Sdk/Lm/LogDataChunkKey.cs

@@ -0,0 +1,19 @@
+namespace Ryujinx.Horizon.Sdk.Lm
+{
+    enum LogDataChunkKey
+    {
+        Start = 0,
+        Stop = 1,
+        Message = 2,
+        Line = 3,
+        Filename = 4,
+        Function = 5,
+        Module = 6,
+        Thread = 7,
+        DropCount = 8,
+        Time = 9,
+        ProgramName = 10,
+
+        Count
+    }
+}

Ryujinx.Horizon/Sdk/Lm/LogDestination.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace Ryujinx.Horizon.Sdk.Lm
+{
+    [Flags]
+    enum LogDestination
+    {
+        TargetManager = 1 << 0,
+        Uart = 1 << 1,
+        UartIfSleep = 1 << 2,
+
+        All = 0xffff
+    }
+}

Ryujinx.Horizon/Sdk/Lm/LogPacketFlags.cs

@@ -0,0 +1,12 @@
+using System;
+
+namespace Ryujinx.Horizon.Sdk.Lm
+{
+    [Flags]
+    enum LogPacketFlags : byte
+    {
+        IsHead = 1 << 0,
+        IsTail = 1 << 1,
+        IsLittleEndian = 1 << 2
+    }
+}

Ryujinx.Horizon/Sdk/Lm/LogPacketHeader.cs

@@ -0,0 +1,15 @@
+using Ryujinx.Horizon.Sdk.Diag;
+
+namespace Ryujinx.Horizon.Sdk.Lm
+{
+    struct LogPacketHeader
+    {
+        public ulong ProcessId;
+        public ulong ThreadId;
+        public LogPacketFlags Flags;
+        public byte Padding;
+        public LogSeverity Severity;
+        public byte Verbosity;
+        public uint PayloadSize;
+    }
+}