Feature: extra arguments for setup:config:set

Nobody has claimed this yet.

### Preconditions
1. Imported Magento 2.2 environment

### Steps to reproduce

1. Import database from production backup
2. Download/copy/sync `app/etc/config.php` from production
3. Set deployment config to your environment using `bin/magento setup:config:set`
4. Run `bin/magento setup:upgrade`
4. Go to your webserver and it'll tell you that the environment is not installed yet.

### Expected result

1. It would be great if one could tell the `setup:config:set` command that the environment is installed.
2. The environment works after these steps

### Actual result

1. The `install` configuration is missing in `app/etc/env.php`
2. I can't use the environment, except by adding the `install` configuration to `app/etc/env.php`

I would really like the following arguments to be added to the `setup:config:set` command:
- `--install Set install date`
- `--mage-mode Set mage mode`

If you agree, I'd gladly make a Pull Request to make this happen!

**Original Report**: https://github.com/magento/magento2/issues/11318 by @tdgroot

Start with the setup:config:set command and the configuration files app/etc/env.php and app/etc/config.php described in the issue. Check how the command currently writes deployment settings, then verify that the requested --install and --mage-mode arguments produce a usable environment after setup:upgrade.

Written by the indexing model from the issue text.