drupal generate:plugin:migrate:source should include "source_module" definition

[kalevitan]

Problem/Motivation

Migrate API requires all source plugins have a "source_module" defined in the annotation.

Details to include:

• Since it's a requirement, and Drupal throws an error if not present, I suggest that a prompt be added to include a source module when generating a migrate source plugin.

Details to include:

• Drupal version 8.5.1
• Console version 1.80

Example Output Result

/**
 * field_collection_item source.
 *
 * @MigrateSource(
 *   id = "field_collection_item",
 *   source_module = "field_collection"
 * )
 */

[LOBsTerr]

@jmolivas PR #3858

I have fixed this issue + improved and fixed the code a little bit

[LOBsTerr]

Merged