refactor: swap Enr Debug and Display impl

Closes #13

swap Debug <-> Display impl
Add NodeId Debug impl
Include other fields in Enr Debug impl

Also ran clippy --fix

Example:

Enr {
    id: Some(
        "v4",
    ),
    seq: 1,
    NodeId: 0x161d808320f6252ecaad817dd12154ec5d42d3b781eec1a414505c2ed74a03bc,
    signature: "5269b245b6a2e1c88c9a618c44aba7d4b6a58a8e2adf3e455889d1f3a9eecd2e58276bfda2ec62f3355427326ee3157864b920da95f81a5857e56cfcf9b8ea93",
    IpV4 UDP Socket: Some(
        127.0.0.1:3001,
    ),
    IpV6 UDP Socket: None,
    IpV4 TCP Socket: Some(
        127.0.0.1:3000,
    ),
    IpV6 TCP Socket: None,
    Other Pairs: [
        (
            "other",
            "836d7367",
        ),
        (
            "secp256k1",
            "a103bb51d4612f592c7d2d2114427191360dbeb4cd7941bed7264ab0e3d3c658257a",
        ),
    ],
}

sigp / enr

refactor: swap Enr Debug and Display impl #15