fix: use proper xid types for xpending range (#436)

Author: ArturSharapov

redis.ts

@@ -1922,8 +1922,8 @@ class RedisImpl implements Redis {
     consumer?: string,
   ) {
     const args = [];
-    args.push(startEndCount.start);
-    args.push(startEndCount.end);
+    args.push(xidstr(startEndCount.start));
+    args.push(xidstr(startEndCount.end));
     args.push(startEndCount.count);
 
     if (consumer) {

stream.ts

@@ -137,8 +137,8 @@ export interface XPendingCount {
  * args must be specified if _any_ are specified.
  */
 export interface StartEndCount {
-  start: number | "-";
-  end: number | "+";
+  start: XIdNeg;
+  end: XIdPos;
   count: number;
 }