Create a aws:ses:check command

[Aerendir]

Is your feature request related to a problem? Please describe.
The command should check that all the minimum requirements are met.

Describe the solution you'd like
For example, it should check for the following things:

1. The Identities are created;
2. The identities are allowed to send emails (ensure they are verified: if they aren't, it is not possible to send emails - find a reference in the SES documentation about this);
3. The identities are subscribed to a topic for notifications (if configured in config/packages/shq_aws_ses_monitor.yaml to notify - don't check the development identity);
4. The topics exist and they are for the correct environment (See Force the use of dev and prod in the name of topics #71);
5. The endpoint for notifications can be reached from the Internet;
6. Check the app can connect to AWS (credentials and other configs are correct);
7. On prod, check the emails are sent through SES (check SwiftMailer configuration);
8. The command should not be run on dev (is this really useful to implement or not?);
9. Try to send a custom test email to ensure all works well (this should be configurable to not send an email on each deployment);
10. SwiftMailer: which checks on SwiftMailer?

Additional context
The command is intended to be used during continuous delivery to check the application is correctly working.

This command is a bit different than the aws:ses:debug command as this one is intended to have a general picture of the configuration, highlighting some other information like, for example, if the notifications include the headers, or other info like those.

This aws:ses:check command, instead, has to check that all the minimum requirements needed to send emails are met.