Fix auth entry charge

[jayz22]

rs-soroban-env/soroban-env-host/src/auth.rs

Lines 855 to 856 in 9c53940

	Vec::<Val>::charge_bulk_init_cpy(auth_entries.len() as u64, host)?;
	trackers.reserve(auth_entries.len());

- Vec::<Val>::charge_bulk_init_cpy(auth_entries.len() as u64, host)?;
+ Vec::<InvokerContractAuthorizationTracker>::charge_bulk_init_cpy(auth_entries.len() as u64, host)?;

[jayz22]

Using this to track a couple of other issue surfaced during the same review:

On line 1018 in auth.rs in function snapshot you seem to allocate a vector to store authorization snapshots but then charge for the allocation afterwards. Can you confirm that the charge should happen before the allocation?

and

On lines 694-700 in auth.rs in the function new_enforcing (for AuthorizationManager) I noticed that you allocate a vector of AccountAuthorizationTrackers of size num_entries. However, the vector you allocate is of type Vec<RefCell> so the amount of memory allocated is actually num_entries*(sizeof(RefCell)). The difference in memory allocated is n*(sizeof(RefCell) - sizeof(AccountAuthorizationTracker)). Why not try and account for the difference when charging?

[jayz22]

resolved by #1340