Improve error message for `Unable to resolve service for type <TenantInfo> while attempting to activate...`

[fdcastel]

I'm having this problem now and it is surely a configuration problem. But the generic message isn't helpful pointing to where the problem is.

It seems several other issues (#799, #465, #340, #140) had the same problem.

More informative messages like

• No tenant with id = "ACME" was found in the configured stores.
• No MultiTenant Strategy registered. Please see https://www.finbuckle.com/MultiTenant/Docs/ConfigurationAndUsage
• No MultiTenant Store registered. Please see https://www.finbuckle.com/MultiTenant/Docs/ConfigurationAndUsage and others would surely help.

This way, if we see the generic Unable to resolve service for type ... message again we could probable use this as a good indicator for "You forgot to call .Add/UseMultitenant()."

Also: #628 (related).

[AndrewTriesToCode]

I like this idea. One reason I removed DI for TenantInfo was to eliminate one major cause of these exceptions and these errors messages would go further.