fix(stream): set the value of ratio of vnode stream thread factor to be 4.0 by default.

source/common/src/tglobal.c

@@ -55,7 +55,7 @@ int32_t tsNumOfMnodeQueryThreads = 4;
 int32_t tsNumOfMnodeFetchThreads = 1;
 int32_t tsNumOfMnodeReadThreads = 1;
 int32_t tsNumOfVnodeQueryThreads = 4;
-float   tsRatioOfVnodeStreamThreads = 2.0;
+float   tsRatioOfVnodeStreamThreads = 4.0;
 int32_t tsNumOfVnodeFetchThreads = 4;
 int32_t tsNumOfVnodeRsmaThreads = 2;
 int32_t tsNumOfQnodeQueryThreads = 4;