Pro 4257 modal operation

[falkodev]

Summary

Add the ability to have custom modals for batch operations, and align props between doc context menu custom modal and batch operation custom modal, in order to use the same component.

What are the specific steps to test this change?

Test with apostrophecms/import-export#2

What kind of change does this PR introduce?

(Check at least one)

• Bug fix
• New feature
• Refactor
• Documentation
• Build-related changes
• Other

Make sure the PR fulfills these requirements:

• It includes a) the existing issue ID being resolved, b) a convincing reason for adding this feature, or c) a clear description of the bug it resolves
• The changelog is updated
• Related documentation has been updated
• Related tests have been updated

[linear]

PRO-4257 As a developer, I can use the modal property in my batch operations

Like for the method addContextOperation available in the module apostrophecms/doc, the batch operations must support the method modal, ex:

  batchOperations (self) {
    return {
      add: {
        export: {
          label: 'Download',
          modal: 'AposMyComponent'
        }
      }
    };
  }

This way, when clicking on the batch operation button, will be able to open a specific modal for more specific and complex behaviors.

We'll need this feature to be able to open the same export modal when clicking on the download button in batch operations than when clicking on the download button in the contextual menu of a single document.

You can base your work on the way it works currently for the addContextOperation method.

Acceptance Criteria

• The new property modal is available in each batch operation action.
• Whatever modal is opened when using this feature, it must at least get an array of IDs of the selected documents (to be able to perform needed API calls itself).