Add drush generate command for Form alter as plugin module

Problem/Motivation

Currently, the Form alter as plugin module lacks a Drush command to generate a plugin. This feature would significantly improve developer productivity by automating the creation of form alter plugins.

Proposed resolution

Add a Drush command to the Form alter as plugin module that allows developers to generate form alter plugins easily.

Remaining tasks

• Develop the Drush command.
• Update documentation to include usage instructions for the new command

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