Create submodule to generate revisions

Problem/Motivation

To test the module Node Revision Delete it is necessary to have revisions in the content types.

Proposed resolution

Create a submodule of Node Revision Delete to generate revisions of selected node types.

Remaining tasks

#3021317: Create the node_revision_generate.info.yml
#3021324: Create a permission to allow the generation of revisions
#3022083: Create the README.txt file for the node revision generate module
#3022088: Create the composer.json file
#3021493: Create the help page for the node_revision_generate module
#3021531: Create basic structure of the generate revisions form
#3021535: Get all nodes types to show in the generate revisions form
#3021607: Generate Revisions on submit Form
#3022703: Create the menu link for the Generate revisions form

User interface changes

None.

API changes

None.

Data model changes

None.

Release notes snippet

None.