Wire scheduler up to adjust actual loaded accounts size cost for committed transactions

[tao-stones]

Problem

Transaction may set loaded_accounts_data_size limit, or uses default limit, that is higher than it actually loads. When cost model starts to "charge" CU for loaded accounts data size, it is necessary to adjust block space transaction reserved with accounts size it actually loaded, alone with "executed CU" adjustment.

Summary of Changes

• Add loaded_accounts_data_size to Committed enum variance.
• Add loaded_accounts_data_size_cost to cost_tracker adjustment logic in update_execution_cost()

Note

Function of "charging CU for loaded accounts" logic is still behind include_loaded_accounts_data_size_in_fee_calculation gate, therefore this PR does not change Scheduler behavior until #1356

Fixes #

[brooksprumo]

I'm not familiar with this code, and I don't see anything obviously touching accounts-db. @tao-stones, is there a guidance on what you'd like me to look at?

Also, I see this PR does new stuff if a feature gate is active, but I don't see a new feature gate in this PR. That implies to me there's already an existing feature gate issue. Can you update the PR description to include the issue number and label (if you edit the PR description, you'll see them as comments at the bottom)? This will help me with the additional context. Thanks!

[tao-stones]

I'm not familiar with this code,

My apology - meant to add @bw-solana to this PR

[bw-solana]

LGTM