feat: support logx.WithFields (#2128)

core/logx/fields.go

@@ -0,0 +1,18 @@
+package logx
+
+import "context"
+
+var fieldsContextKey contextKey
+
+type contextKey struct{}
+
+// WithFields returns a new context with the given fields.
+func WithFields(ctx context.Context, fields ...LogField) context.Context {
+	if val := ctx.Value(fieldsContextKey); val != nil {
+		if arr, ok := val.([]LogField); ok {
+			return context.WithValue(ctx, fieldsContextKey, append(arr, fields...))
+		}
+	}
+
+	return context.WithValue(ctx, fieldsContextKey, fields)
+}