Migrate from ActiveSupport::Configurable to Dry::Configurable

[ericproulx]

Migrate from ActiveSupport::Configurable to Dry::Configurable

This PR migrates Grape's configuration system from ActiveSupport::Configurable to Dry::Configurable, since its deprecated (see #2616)

Changes Made

Dependencies

• Added dry-configurable dependency to grape.gemspec
• Removed dependency on active_support/configurable

Core Changes

• Replaced ActiveSupport::Configurable with Dry::Configurable in the main Grape module
• Updated configuration syntax from config.param_builder = :value to setting :param_builder, default: :value
• Migrated existing configuration settings:
• param_builder (default: :hash_with_indifferent_access)
• lint (default: false)

Code Changes

# Before (ActiveSupport::Configurable)
module Grape
  include ActiveSupport::Configurable

  configure do |config|
    config.param_builder = :hash_with_indifferent_access
    config.lint = false
    config.compile_methods!
  end
end

# After (Dry::Configurable)
module Grape
  extend Dry::Configurable

  setting :param_builder, default: :hash_with_indifferent_access
  setting :lint, default: false
end

Benefits

1. Reduced Dependencies: Removes dependency on active_support/configurable, reducing the overall dependency footprint
2. Better Performance: Dry::Configurable is more lightweight and focused specifically on configuration needs
3. Cleaner API: The new syntax is more declarative and easier to understand
4. Maintained Compatibility: All existing configuration options remain available with the same names

Documentation Updates Needed

The following documentation files will need to be updated in a follow-up PR:

• README.md - Update configuration examples
• UPGRADING.md - Add migration guide for configuration changes

Testing

• All existing tests pass without modification
• Configuration functionality is fully preserved
• The api_remount_spec.rb tests that use dynamic configuration continue to work as expected

[dblock]

Some missing ... periods ;) Feel free to merge after.

[dblock]

Suggested change

	Grape has migrated from `ActiveSupport::Configurable` to `Dry::Configurable` for its configuration system since its [deprecated](https://github.com/rails/rails/blob/1cdd190a25e483b65f1f25bbd0f13a25d696b461/activesupport/lib/active_support/configurable.rb#L3-L7)
	Grape has migrated from `ActiveSupport::Configurable` to `Dry::Configurable` for its configuration system since its [deprecated](https://github.com/rails/rails/blob/1cdd190a25e483b65f1f25bbd0f13a25d696b461/activesupport/lib/active_support/configurable.rb#L3-L7).

[dblock]

Suggested change

	* [#2617](https://github.com/ruby-grape/grape/pull/2617): Migrate from ActiveSupport::Configurable to Dry::Configurable - [@ericproulx](https://github.com/ericproulx).
	* [#2617](https://github.com/ruby-grape/grape/pull/2617): Migrate from `ActiveSupport::Configurable` to `Dry::Configurable` - [@ericproulx](https://github.com/ericproulx).

[dblock]

Actually, I think we can preserve this to avoid a breaking change?

Grape.configure do |config|
  config.param_builder = :hashie_mash
  config.lint = true
end
``

[ericproulx]

Actually, I think we can preserve this to avoid a breaking change?

Grape.configure do |config|
  config.param_builder = :hashie_mash
  config.lint = true
end
``

It's a lie from AI. It's still working.