[8.x] Add default_publish_state config option

[duncanmcclean]

This pull request adds a default_publish_state config option to resources, allowing you to determine if new models should be drafts or published by default:

'resources' => [
	\App\Models\Post::class => [
	    'name' => 'Posts',
		'published' => true,
		'default_publish_state' => 'draft',
	],
],

This PR also fixes an issue when using revisions, where new models were published, even though they should have been drafts.

[github-actions]

Released as part of v8.7.0.