[1.2.0] `pool_id` fallbacks to `worker_module`

What's Changed

Added

• Added Elixir 1.18.* support to CI.

Changed

• Refactored tests with new ExUnit parameterize feature.
• :pool_id is not required init option anymore. For now it is equal to worker_module option value.

Fixed

• Functions Poolex.add_idle_workers!/2 and Poolex.remove_idle_workers!/2 now accept any value of type GenServer.name() as their first argument, instead of only atom().
• Supressed Supervisor's error logs in tests.

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Full Changelog: v1.1.0...v1.2.0