Fix Ruby 3.0 compatibility

[v-kolesnikov]

Describe the bug

Tests don't pass on Ruby 3.0

To Reproduce

$ rvm use 3.0
$ rake spec

Expected behavior

Tests passed

---

Objective

ROM configuration is broken on Ruby 3.0 because of Separation of positional and keyword arguments in Ruby 3.0. It is mostly on rom-core side:
https://github.com/rom-rb/rom/blob/v5.2.5/core/lib/rom/environment.rb#L16-L53

In general all def method(*args) should be replaced to def method(*args, **kwargs), but this is not so simple in some cases (such above).

UPD:

I prepared a small proof to demonstrate the bug:

# frozen_string_literal: true

require 'bundler/inline'

gemfile(_install = true) do
  source 'https://rubygems.org'
  gem 'rom-core', '~> 5.2', '>= 5.2.4'
  gem 'rspec'
end

module MyAdapter
  class Gateway
    extend ROM::Initializer

    param :param
    option :option
  end
end

ROM.register_adapter(:my_adapter, MyAdapter)

require 'rspec/autorun'

RSpec.describe MyAdapter do
  specify do
    gw = MyAdapter::Gateway.new(:param, option: :option)
    expect(gw.param).to eq :param
    expect(gw.option).to eq :option
  end

  specify do
    conf = ROM::Configuration.new(:my_adapter, :param, option: :option)
    container = ROM.container(conf)
    gw = container.gateways[:default]
    expect(gw.param).to eq :param
    expect(gw.option).to eq :option
  end
end

On Ruby 2.7:

~/.rvm/gems/ruby-2.7.1/gems/rom-core-5.2.4/lib/rom/environment.rb:53: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
~/.rvm/gems/ruby-2.7.1/gems/rom-core-5.2.4/lib/rom/gateway.rb:83: warning: The called method `setup' is defined here
.

Finished in 0.00322 seconds (files took 0.07245 seconds to load)
2 examples, 0 failures

On Ruby 3.0:

.F

Failures:

  1) MyAdapter
     Failure/Error: conf = ROM::Configuration.new(:my_adapter, :param, option: :option)

     KeyError:
       MyAdapter::Gateway: option 'option' is required
     # (eval):6:in `block in __dry_initializer_initialize__'
     # (eval):6:in `fetch'
     # (eval):6:in `__dry_initializer_initialize__'
     # /Users/b.white/.rvm/gems/ruby-3.0.0-rc1/gems/dry-initializer-3.0.4/lib/dry/initializer/mixin/root.rb:7:in `initialize'
     # /Users/b.white/.rvm/gems/ruby-3.0.0-rc1/gems/rom-core-5.2.4/lib/rom/gateway.rb:96:in `new'
     # /Users/b.white/.rvm/gems/ruby-3.0.0-rc1/gems/rom-core-5.2.4/lib/rom/gateway.rb:96:in `setup'
     # /Users/b.white/.rvm/gems/ruby-3.0.0-rc1/gems/rom-core-5.2.4/lib/rom/environment.rb:53:in `block in normalize_gateways'
     # /Users/b.white/.rvm/gems/ruby-3.0.0-rc1/gems/rom-core-5.2.4/lib/rom/environment.rb:47:in `each'
     # /Users/b.white/.rvm/gems/ruby-3.0.0-rc1/gems/rom-core-5.2.4/lib/rom/environment.rb:47:in `each_with_object'
     # /Users/b.white/.rvm/gems/ruby-3.0.0-rc1/gems/rom-core-5.2.4/lib/rom/environment.rb:47:in `normalize_gateways'
     # /Users/b.white/.rvm/gems/ruby-3.0.0-rc1/gems/rom-core-5.2.4/lib/rom/environment.rb:28:in `configure_gateways'
     # /Users/b.white/.rvm/gems/ruby-3.0.0-rc1/gems/rom-core-5.2.4/lib/rom/environment.rb:20:in `initialize'
     # /Users/b.white/.rvm/gems/ruby-3.0.0-rc1/gems/rom-core-5.2.4/lib/rom/configuration.rb:53:in `new'
     # /Users/b.white/.rvm/gems/ruby-3.0.0-rc1/gems/rom-core-5.2.4/lib/rom/configuration.rb:53:in `initialize'
     # rom_ruby3.rb:32:in `new'
     # rom_ruby3.rb:32:in `block (2 levels) in <main>'

Finished in 0.00311 seconds (files took 0.08745 seconds to load)
2 examples, 1 failure

Failed examples:

rspec rom_ruby3.rb:31 # MyAdapter

[v-kolesnikov]

@solnic Now I think this issue should be addressed to rom-core.

[solnic]

@v-kolesnikov makes sense, I'm gonna cherry-pick the fix into release-5.2 btw (once you're done with your PR 😃)