fix: tick size cache

[sahilgat02]

Note

Low Risk
Limited to client-side caching behavior for tick sizes and a version bump; low risk aside from potentially changing when tick sizes are refetched.

Overview
Improves tick-size caching in ClobClient by adding TTL-based invalidation (default 300s), storing monotonic timestamps per token, and exposing clear_tick_size_cache() to force refreshes.

get_order_book()/get_order_books() now opportunistically update the tick-size cache from OrderBookSummary.tick_size responses to reduce extra tick-size fetches. Package version is bumped to 0.34.6.

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