Increase number of buckets in grace join& 32x2 -> 64x2

Increasing the number of buckets in grace join, because during TPCH10k two buckets no longer fit in memory
commit_hash:1bf800015b4cf19f24f34bedbb52f1f809f569e8

Author: lll-phill-lll

yql/essentials/minikql/comp_nodes/mkql_grace_join_imp.h

@@ -14,7 +14,7 @@ class TTableBucketSpiller;
 #define GRACEJOIN_DEBUG DEBUG
 #define GRACEJOIN_TRACE TRACE
 
-const ui64 BitsForNumberOfBuckets = 5; // 2^5 = 32
+const ui64 BitsForNumberOfBuckets = 6; // 2^6 = 64
 const ui64 BucketsMask = (0x00000001 << BitsForNumberOfBuckets)  - 1;
 const ui64 NumberOfBuckets = (0x00000001 << BitsForNumberOfBuckets);  // Number of hashed keys buckets to distribute incoming tables tuples
 const ui64 DefaultTuplesNum = 101; // Default initial number of tuples in one bucket to allocate memory