add stream chat (#811)

### What problem does this PR solve?

#709 
### Type of change

- [x] New Feature (non-breaking change which adds functionality)

rag/utils/es_conn.py

@@ -43,6 +43,9 @@ class ESConnection:
         v = v["number"].split(".")[0]
         return int(v) >= 7
 
+    def health(self):
+        return dict(self.es.cluster.health())
+
     def upsert(self, df, idxnm=""):
         res = []
         for d in df:

rag/utils/minio_conn.py

@@ -34,6 +34,16 @@ class RAGFlowMinio(object):
         del self.conn
         self.conn = None
 
+    def health(self):
+        bucket, fnm, binary = "_t@@@1", "_t@@@1", b"_t@@@1"
+        if not self.conn.bucket_exists(bucket):
+            self.conn.make_bucket(bucket)
+        r = self.conn.put_object(bucket, fnm,
+                                 BytesIO(binary),
+                                 len(binary)
+                                 )
+        return r
+
     def put(self, bucket, fnm, binary):
         for _ in range(3):
             try:

rag/utils/redis_conn.py

@@ -44,6 +44,10 @@ class RedisDB:
             logging.warning("Redis can't be connected.")
         return self.REDIS
 
+    def health(self, queue_name):
+        self.REDIS.ping()
+        return self.REDIS.xinfo_groups(queue_name)[0]
+
     def is_alive(self):
         return self.REDIS is not None