rename all parameters to use snake_case everywhere.

[azjezz]

currently, functions use $snake_case for parameters, and methods use $camelCase, IMO, parameters should be $snake_case everywhere.

e.g:

$semaphore = new Async\Semaphore(concurrency_limit: $a, operation: $b);

instead of

$semaphore = new Async\Semaphore(concurrencyLimit: $a, operation: $b);

[azjezz]

cc @veewee WDYT?

[veewee]

Sounds good: I'm all in on consistancy! I assume there will be a cs rule enforcing and fixing this for us somewhere.

[githubjeka]

What is the reason not to do like in psr-12 ?