feat(container/gpool): add generic pool feature

[joy999]

add TPool[T] and let Pool base on it.

[Copilot]

Pull Request Overview

This PR introduces a generic pool implementation TPool[T] to the gpool package and refactors the existing Pool type to use it as a foundation. The main purpose is to add type-safe generic pool functionality while maintaining backward compatibility with the existing Pool API.

Key Changes:

• Added a new generic TPool[T] implementation with full pool functionality
• Refactored Pool to wrap TPool[any] instead of maintaining duplicate implementation
• Unified the codebase by eliminating code duplication between generic and non-generic pool types

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
container/gpool/gpool_t.go	Implements the new generic TPool[T] type with all pool operations (Get, Put, Clear, etc.) and expiration management
container/gpool/gpool.go	Refactored to delegate all operations to the embedded TPool[any], converting Pool into a thin wrapper for backward compatibility

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