starknet_committer: create sotrage tries sequentially

[nimrod-starkware]

Note

Low Risk
Pure refactor that extracts existing logic into a helper with no functional changes expected; risk is limited to accidental signature/flow regressions in storage-trie construction.

Overview
Refactors create_storage_tries by moving its per-contract loop into a new private helper, create_storage_tries_sequentially, and delegating to it.

Behavior is intended to be unchanged: it still iterates through actual_storage_updates, looks up sorted leaf indices and prior contract state, and builds an original skeleton storage trie per contract before returning the map.

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[reviewable-StarkWare]

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[nimrod-starkware]

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• starknet_patricia_storage: spawn blocking tasks for rocksDB reads #12168 : 2 dependent PRs (#12169 , #12172 )
• starknet_committer: parallel reads using unordered futures #12167
• starknet_committer: create sotrage tries sequentially #12166 👈 (View in Graphite)
• starknet_patricia,starknet_committer: dont pass storage mut when not needed #12165
• starknet_patricia_storage: non mut get in storage trait #12123 : 1 other dependent PR (#12252 )
• starknet_patricia_storage: dont cache reads in cached storage #12251
• starknet_patricia_storage: atomic counters for read stats #12122
• main-v0.14.2

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[ArielElp]

@ArielElp reviewed 1 file and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @nimrod-starkware).

[dorimedini-starkware]

@dorimedini-starkware reviewed 1 file and all commit messages.
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