fix(alloy): add nonce filler cache controls

[mattsse]

Adds NonceKeyFiller::clear() so callers can drop all tracked (address, nonce_key) pairs and force the next fill to refetch nonces from the chain.

Also adds cache controls via with_caching_enabled(false), set_caching_enabled(false), and disable_caching(). When caching is disabled, every fill refetches the nonce from the chain instead of reusing the cached value or incrementing it locally.

Includes focused tests for the cache clear path and the cache-disabled refetch behavior.

[github-actions]

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tempo-alloy: minor
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Added configurable nonce caching to `NonceKeyFiller` with methods to enable/disable caching and clear tracked nonce state, allowing forced refetches from the chain.

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