feat: add rate limit & reduce max batch size

[kbizikav]

No description provided.

[Copilot]

Pull Request Overview

This PR introduces client-side rate limiting and reduces maximum batch sizes to prevent overwhelming external APIs. The changes implement a token bucket rate limiter with configurable RPS and burst capacity, while decreasing batch size limits to reduce load on validity prover and store vault servers.

Key changes:

• Reduced MAX_BATCH_SIZE from 128 to 32 for validity prover and from 256 to 64 for store vault server
• Added RequestRateLimiter with cross-platform support (native and WASM)
• Integrated rate limiting into ValidityProverClient, StoreVaultServerClient, and S3StoreVaultClient

Reviewed Changes

Copilot reviewed 8 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
interfaces/src/api/validity_prover/interface.rs	Reduced MAX_BATCH_SIZE constant from 128 to 32
interfaces/src/api/store_vault_server/interface.rs	Reduced MAX_BATCH_SIZE constant from 256 to 64
client-sdk/src/external_api/validity_prover.rs	Added rate limiting to ValidityProverClient with helper methods for rate-limited requests
client-sdk/src/external_api/utils/rate_limit.rs	Implemented token bucket rate limiter with WASM and native support
client-sdk/src/external_api/utils/mod.rs	Exported rate_limit module
client-sdk/src/external_api/store_vault_server.rs	Integrated rate limiting into StoreVaultServerClient
client-sdk/src/external_api/s3_store_vault.rs	Integrated rate limiting into S3StoreVaultClient
client-sdk/Cargo.toml	Added instant dependency for WASM time support

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