Do not use require_relative with native extension

[Annih]

Replace require_relative "../llhttp_ext" by require "llhttp_ext" to load the native extension.
This improves compatibility with Bundler and RubyGems, especially in environments using bundle install --standalone or other setups where the extension may not be located relative to the Ruby file.

Using require ensures the extension is loaded from the load path, following RubyGems best practices for native extensions.

Fix #33

[Annih]

I successfully tested it against our bundle install --standalone setup, but also against a more standard bundle install.

[bryanp]

Thanks @Annih, it looks like there are some test failures. Can you look?

[Annih]

OK @bryanp I'm checking, but this does not seem related to my change (I tested in local with and without my change I reproduce 100%)
The curl call times out (it even stay after the test session on my local machine)

[Annih]

From my quick investigation the issue comes from io-event after the version >= 1.9.0. I will dig a bit later the changelog.

[Annih]

OK so the project async-http faced a similar issue and reported the compat issue between recent IO-event version and fork processed in socketry/io-event#36
They seem to have fix (one of?) their issue using synchronous block for the IO endpoint see socketry/async-http#100

I will submit a pin of io-event to demonstrate it works well, then let me know what you really want me to do 🤷🏻‍♂️

[Annih]

@bryanp could you approve the workfow to validate it works well with the pin?

[bryanp]

Apologies @Annih, I got busy 😅

Just approved the workflow. Tests pass now but one minor linter issue.

[Annih]

No problem @bryanp I was busy too :) I should have fixed the linter issue!