[State Sync] Increase the default batch size and prefetcher.
[State Sync] Increase the default batch size and prefetcher.

aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core