feat(meq): use simd to improve performance of meq

[rymnc]

Warning

This is an experimental PR, not to be merged in, but to start a conversation about using simd when it lands in stable ~ or use a different library to access arch-specific simd instructions. While doing the zkvm benchmarks with large meq's, it results in a lot of execution cycles and proving time. This enhancement should improve things there.

[Link to related issue(s) here, if any]

[Short description of the changes.]
Usage of cpu intrinsics (neon, avx2, avx512f) to improve memory compare performance. detected upto 40% on neon, and 20-30% using avx2.

avx2 and avx512f can probably be optimised in terms of the masking

Checklist

• Breaking changes are clearly marked as such in the PR description and changelog
• New behavior is reflected in tests
• If performance characteristic of an instruction change, update gas costs as well or make a follow-up PR for that
• 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?