fix: tick size

[sahilgat02]

Note

Medium Risk
Changes tick-size caching behavior used for order validation, which could affect pricing checks or increase API calls if misconfigured. Scope is limited to ClobClient with a conservative default TTL and explicit cache invalidation.

Overview
Improves tick-size correctness by turning the in-memory tickSizes map into a TTL-based cache (default 5 minutes, configurable via a new tickSizeTtlMs constructor arg) and tracking per-token cache timestamps.

getOrderBook/getOrderBooks now opportunistically refresh the tick size cache from OrderBookSummary.tick_size, and a new clearTickSizeCache(tokenID?) API allows forcing a refetch on next access.

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