Return early if the input is the plaintext

[bee-san]

Currently Ares doesn't check the initial input with its checkers. This causes weird printing like this:

cargo run -- -t '192.168.0.1'
I think the plaintext is a Internet Protocol (IP) Address Version 4.
Possible plaintext: '192.168.0.1' (y/N):
y
Ares has decoded 111 times
SUCCESSFUL 😁
PLAINTEXT: ["192.168.0.1"]
DECODERS USED: Reverse → Reverse

With this PR Ares returns early if the input passes any of our checkers.

This is enabled in lib.rs which is used both by the API and the CLI.