Add Rails generators

[ezekg]

Some examples:

• rails g request_migrations:install to set up an initializer config and maybe a BaseMigration under app/migrations/.
• rails g request_migrations:migration to scaffold new migrations under app/migrations/.

[mhmdAljefri]

I would like to help on this @ezekg

[ezekg]

Would love some help, @mhmdAljefri! Open a PR whenever.