feature: callable default_view_type

[Paul-Bob]

Description

This enables the possibility to define a proc on default_view_type option. It's useful when we want different default view types according to the user or used device.

class Avo::Resources::Post < Avo::BaseResource
  self.default_view_type = -> {
    mobile_user = request.user_agent =~ /Mobile/

    mobile_user ? :table : :grid
  }
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
  • feature: callable default_view_type docs.avohq.io#188
• I have added tests that prove my fix is effective or that my feature works

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[github-actions]

This PR has been merged into main. The functionality will be available in the next release.

Please check the release guide for more information.