feat: Use caddy's internal Proxy protocol module

[Embraser01]

Also deprecated the one we have as it's redundant with the one included in caddy and people should use the one provided by caddy.

Because it's the same library behind, I do not expect any breaking change.

I'll let it in draft until the new proxyprotol module is merged and released in caddy (https://github.com/caddyserver/caddy/pull/5915)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 18.34%. Comparing base (c3c4342) to head (0334775).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #166 +/- ## ========================================== - Coverage 18.90% 18.34% -0.57% ========================================== Files 30 30 Lines 1063 1063 ========================================== - Hits 201 195 -6 - Misses 861 867 +6 Partials 1 1 ```

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