Add strapi role permission support

[Accrypt]

Feature request

Summary

This is a fantastic plugin, but unfortunately it allows anyone by default to access the email designer plugin page.
Integration should be made with the strapi role based permissions to limit who can view and edit email templates.

Why is it needed?

Strapi is built around the fact that only certain roles have access to certain features, this plugin should not be an exception.
Base level of users aren't even allowed to publish content, only draft it. I defiantly don't want them being able to edit my email templates.

Suggested solution(s)

Include simple findMany, findOne, create, update and delete permissions.
I've made a patch with a single 'read' permission which currently handles all of these features, as I simply need an all or nothing solution and am unfamiliar with strapi plugins.

Related issue(s)/PR(s)

No PR, but I do have a patch file with example changes which I have working on my strapi environment to limit email designer access.
strapi-plugin-email-designer+2.1.1.patch.zip

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