Commits on Feb 15, 2022

1. core, ethdb, tests, trie: implement NewBatchWithSize API for batcher …

   This PR adds an addtional API called `NewBatchWithSize` for db
   batcher. It turns out that leveldb batch memory allocation is
   super inefficient. The main reason is the allocation step of
   leveldb Batch is too small when the batch size is large. It can
   take a few second to build a leveldb batch with 100MB size.
   
   Luckily, leveldb also offers another API called MakeBatch which can
   pre-allocate the memory area. So if the approximate size of batch is
   known in advance, this API can be used in this case.
   
   It's needed in new state scheme PR which needs to commit a batch of
   trie nodes in a single batch. Implement the feature in a seperate PR.

   

   rjl493456442 committed Feb 15, 2022
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