[draft] [feat]: template for limit session count

[mustafadeel]

Changes

Adding a template for limiting session counts as defined in this repo:
https://github.com/abbaspour/actions-gallery/blob/main/post-login/session-count/limit-session-count.js

• I described the changes on this PR.

References

https://github.com/abbaspour/actions-gallery/blob/main/post-login/session-count/limit-session-count.js

• I added at least one link to explain why this change is needed.

Checklist

• I have manually tested any new or updated actions templates in a real auth0 account.
• This pull request's title matches the conventional commit format
• This branch is up to date with main
• All existing and new checks complete without errors
• I have read the Auth0 general contribution guidelines
• I have read the Auth0 Code of Conduct
• I have read the Contribution guide for this repository

[nelsonmaia]

I would consider using session.revoke instead of access.deny for when the count is > MAX_SESSION.

Instead of

if (count >= MAX_SESSION) { api.access.deny('max sessions reached'); }

I would use 

`if (count >= MAX_SESSION) {
    api.session.revoke('max sessions reached');
}`

While both will deny the user authentication, using access.deny won't invalidate the session and if the user clicks login again, he will be redirected straight to the same error page. This UX can be confusing for the user.

Using session.revoke, when the user clicks login, credentails will be asked again

[mustafadeel]

I would consider using session.revoke instead of access.deny for when the count is > MAX_SESSION.

Instead of

if (count >= MAX_SESSION) { api.access.deny('max sessions reached'); }

I would use 

`if (count >= MAX_SESSION) {
    api.session.revoke('max sessions reached');
}`

While both will deny the user authentication, using access.deny won't invalidate the session and if the user clicks login again, he will be redirected straight to the same error page. This UX can be confusing for the user.

Using session.revoke, when the user clicks login, credentails will be asked again

thanks! i've updated it. Small note, also changed to > MAX_SESSIONS instead of >= :)