feat(gas_price_service): improve performance of SharedGasPriceAlgo by replacing underlying RwLock with SeqLock

[rymnc]

Warning

Merging blocked by #2524, please review that first :)

Linked Issues/PRs

• none

Description

The SharedGasPriceAlgo implementations, SharedV1Algorithm, SharedV0Algorithm make use of an Arc<parking_lot::Mutex<A>>, however, since the internal type used is relatively small, we can make use of SeqLock introduced in #2524, as it meets the requirements of using it, i.e -

1. Small type cheap to copy,
2. Occasional writes, frequent reads

you might wonder that we might have "torn reads" but as long as the data fits in a single cache line we are safe here, and since the size of AlgorithmV1 is 40 bytes (padding incl), it fits in a 64-byte cache-line, and hence is safe to use with SeqLock

fetching the gas price is a very frequent operation, and although it might be cached by higher layers, we benefit from the SeqLock, as presented in the following benchmark result:

the baseline for the benchmark was generated using this branch: chore/baseline-shared-gas-price-algo-bench

Checklist

• Breaking changes are clearly marked as such in the PR description and changelog
• New behavior is reflected in tests
• The specification matches the implemented behavior (link update PR if changes are needed)

Before requesting review

• I have reviewed the code myself
• I have created follow-up issues caused by this PR and linked them here

After merging, notify other teams

[Add or remove entries as needed]

• Rust SDK
• Sway compiler
• Platform documentation (for out-of-organization contributors, the person merging the PR will do this)
• Someone else?

[rymnc]

this should not have been labelled for release

[rymnc]

closing as not planned to integrate :)