`fix(OnEvict)`: Set missing Expiration field on evicted items

[0x1ee7]

On our use case we need to rely on expiration timestamps but we realized that they return zero timestamps. Our assumption is that this is due to a bug and not by design.

Problem

When OnEvict callback is executed Item does not have Expiration field set. Considering it is a public field this needs to be set and available.

Solution

Initialize Expiration field before calling the onEvict callback

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