trace: add dummy implementation of the tracing object

src/trace.zig

@@ -0,0 +1,32 @@
+const std = @import("std");
+
+const PendingTrace = struct {};
+
+pub const Trace = struct {
+    pub fn init(self: *Trace) void {
+        _ = self;
+    }
+
+    pub fn deinit(self: *Trace) void {
+        _ = self;
+    }
+
+    pub fn beginIO(self: *Trace, disk: bool, source: std.builtin.SourceLocation) PendingTrace {
+        _ = self;
+        _ = disk;
+        _ = source;
+        return .{};
+    }
+
+    pub fn failIO(self: *Trace, pending_trace: PendingTrace, e: anyerror) void {
+        _ = self;
+        _ = pending_trace;
+        _ = e;
+    }
+
+    pub fn completeIO(self: *Trace, pending_trace: PendingTrace, result: anytype) void {
+        _ = self;
+        _ = pending_trace;
+        _ = result;
+    }
+};