Ledger/transaction_logic: extract local_state module to separate

file

Split the large transaction_logic.rs file by extracting the
local_state module (947 lines) into its own file at
ledger/src/scan_state/transaction_logic/local_state.rs.

Changes:
- Created local_state.rs with StackFrame, CallStack, LocalState,
  LocalStateEnv types and zkApp command application functions
- Made apply_zkapp_command_first_pass and
  apply_zkapp_command_second_pass public
- Added module declaration in mod.rs
- Updated import paths in sparse_ledger.rs
- Added all necessary imports (ark_ff::Zero, itertools, BTreeMap,
  AccountIdOrderable, AppendToInputs, zkapps, etc.)
- Removed unused imports from mod.rs (ark_ff::Zero, Itertools)
- Fixed ambiguous Index::zero() call to use IndexInterface::zero()

Author: dannywillems