enhancement: access to the query on all action blocks

[Nevelito]

Description

Fixes #2935

Grants access to the query object throughout the action, enabling its use when rendering the action view.

Here is an example with a test action:

class Avo::Actions::Test::Query < Avo::BaseAction
  self.name = "Test query access"
  self.message = -> {
    "message #{query.count} selected"
  }
  self.cancel_button_label = -> {
    "cancel_button_label #{query.count} selected"
  }
  self.confirm_button_label = -> {
    "confirm_button_label #{query.count} selected"
  }
  self.standalone = true

  def fields
    field :selected, default: "#{query.count} selected def fields"
  end

  def handle(**args)
    succeed "succeed #{query.count} selected"
  end
end

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
  • query access within actions blocks docs.avohq.io#333
• I have added tests that prove my fix is effective or that my feature works

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[Paul-Bob]

Thanks for working on this, @Nevelito!

I've manually tested this PR with the following action code, but it seems there's currently no access to the query object inside the actions.
Let's make sure the query object is accessible within action messages/fields.
Additionally, I've left some code review comments, let me know if you have any questions!

class Avo::Actions::Sub::DummyAction < Avo::BaseAction
  self.name = -> { "Dummy action" }
  self.message = -> { query.first.name }
  self.cancel_button_label = -> { query.first.name }
  self.confirm_button_label = -> { query.first.name }
  self.standalone = true

  def fields
    field :name, default: query.first.name
  end

  def handle(query:, **args)
    succeed query.first.name
  end
end

[Paul-Bob]

This approach makes sense for show, but we should ensure that the conditional check does not apply to handle.

[Paul-Bob]

Thanks for all the work done here @Nevelito it's looking good!

I'll take over from here and adjust the last details before merging.