refactor: batched trees to 2 batches

[ananas-block]

Issue:

• Merkle trees from_account_info took 1.5k CU
• rust ci tests were not executing test_e2e and test_simulate_transactions

Solution:

• reduce the number of Ref casts -> reduces from_account_info calls to 800-900 CU
  1. bloom filter stores are just bytes slices no need to wrap these into a zero copy slice)
  2. make two Batch structs part of BatchMetadata -> removes 2 casts
  3. remove unnecessary account size check in from_bytes (saves 200 CU)