refactor: Preallocate capacity for known size vectors

[howjmay]

Description

Initialize vector with capacity when the upcoming push() with known times.

Test plan

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Release notes

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• [ ] Protocol:
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• [ ] Indexer:
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• [ ] GraphQL:
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• [ ] Rust SDK:

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Name	Status	Preview	Comments	Updated (UTC)
sui-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 9, 2024 2:39pm

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[howjmay]

Thank you for review too