moderation: add self-action prevention

[Samk13]

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Description

• The problem is that an admin could block his own account. With this change, it is possible to prevent the admin from doing that.
• Prevent self-action for: block, deactivate, restore, activate, impersonate and approve.
• Update tests for self-action prevention
• introduce the PreventSelf generator
• introduce _check_permission in users service
• add "PreventSelf" into can_manage and can_impersonate permission
• closes User Management: Admins Can Inadvertently Block Themselves Out. invenio-administration#203

Checklist

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