add api: func (c *Cache[K, V]) Get(key K) (value V ,found bool, leftTTL time.Duration)

Is your feature request related to a problem? Please describe

NO A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

Describe the solution you'd like

refresh ttl use a setWithTTL after a get operation, or support refresh ttl direct.

A clear and concise description of what you want to happen. I'd like refresh the ttl after get a key, like a feature of Guava cache expire after last access

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A clear and concise description of any alternative solutions or features you've considered.

Additional context

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