fix(log): DefaultCaller doesn't returns "pkg/file:line", it returns "file:line" now. For example, both biz/user.go and data/user.go are printed as user.go in logger. It's not clear. (#2274)

Co-authored-by: SeniorPlayer <SeniorPlayer@gg.com>

log/value.go

@@ -32,6 +32,10 @@ func Caller(depth int) Valuer {
 	return func(context.Context) interface{} {
 		_, file, line, _ := runtime.Caller(depth)
 		idx := strings.LastIndexByte(file, '/')
+		if idx == -1 {
+			return file[idx+1:] + ":" + strconv.Itoa(line)
+		}
+		idx = strings.LastIndexByte(file[:idx], '/')
 		return file[idx+1:] + ":" + strconv.Itoa(line)
 	}
 }