manage subscription page for premium users

[TouchySpidey]

unblocks GenesiAI/PluginsWebPortal#137

[ElSalvo96]

@TouchySpidey, see the review and let me know what do you think about

[ElSalvo96]

@TouchySpidey, see the review and let me know what do you think about

Or, probably is better something like that:

    public async Task<bool> IsUserPremium(string userId)
    {
        var result =await GetSubscriptionInfo(userId)                        //take the last added
        return result?.Status == SubscriptionStatus.Active;  //and check if it is active
    }

public async Task<SubscriptioObj> GetSubscriptionInfo(string userId)
{
    var subscription = await context.Subscriptions
        .Where(s => s.UserId == userId && s.ExpiresOn > DateTime.UtcNow)
        .OrderByDescending(s => s.CreatedOn)
        .FirstOrDefaultAsync();

    return subscription
}

With that the next time you have always the last row and we can add all fields.

Note: I don't know well the code and C#, so check the code that I have written above. Probability: I'm completely wrong!

[TouchySpidey]

good ideas, but for now let's leave the code as it is
maybe open a issue to remember it as a future improvements?
@EkimoCode agrees to not overcomplicate this matter for now

[ElSalvo96]

I agree! I have opened a new issue #65.
Let's close this and go forward!

After your merge remember to attach the swagger in this chat!
Nice job!

[ElSalvo96]

This optimization, can be done in the future