Export form submissions independently of forms

[duncanmcclean]

Description

It should be possible to export form submissions independently of forms.

For example: I store forms in flat files, but form submissions in the database. Currently, when I run php please eloquent:export-forms, I get an error:

   Illuminate\Contracts\Container\BindingResolutionException 

  Target class [statamic.eloquent.forms.model] does not exist.

  at vendor/laravel/framework/src/Illuminate/Container/Container.php:1163
    1159▕ 
    1160▕         try {
    1161▕             $reflector = new ReflectionClass($concrete);
    1162▕         } catch (ReflectionException $e) {
  ➜ 1163▕             throw new BindingResolutionException("Target class [$concrete] does not exist.", 0, $e);
    1164▕         }
    1165▕ 
    1166▕         // If the type is not instantiable, the developer is attempting to resolve
    1167▕         // an abstract type such as an Interface or Abstract Class and there is

      +29 vendor frames 

  30  please:18
      Illuminate\Foundation\Application::handleCommand(Object(Symfony\Component\Console\Input\ArgvInput))

You can workaround it right now by moving forms to the database via php please install:eloquent-driver, then running the export command again.