feat: Implementing the Copy trait for Extension

[0x676e67]

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[0x676e67]

This pull request involves several changes to the src/connect.rs and src/socks/server/mod.rs files, focusing on modifying the way Extension is passed to various functions. The changes primarily involve passing Extension by value instead of by reference.

Key changes include:

Changes in src/connect.rs:

• Modified the assign_ipv4_from_extension and assign_ipv6_from_extension functions to take Extension by value instead of by reference. [1] [2]
• Updated methods in TcpConnector and UdpConnector to pass Extension by value instead of by reference. This includes methods like connect, create_socket_with_cidr, and create_socket_with_cidr_and_fallback. [1] [2] [3] [4] [5] [6] [7] [8] [9]
• Modified the combined function to take Extension by value instead of by reference.
• Updated the test_assign_ipv4_from_extension test to pass Extension by value.

Changes in src/extension.rs:

• Changed the Extension enum to derive the Copy trait, allowing it to be passed by value more easily.

Changes in src/socks/server/mod.rs:

• Updated the hanlde_connect_proxy function to pass Extension by value instead of by reference.