Cannot continuewith on a recurring job

I'd like to continuewith after a recurring job succeeds.

```
RecurringJob.AddOrUpdate("id1", j => j.Run(), Cron.Monthly(1, 4, 5));
var continueJobId = BackgroundJob.ContinueWith("id1", j => j.Run());
```

But this throws a cannot parse number from string error. Then when the `id1` is a number instead I get:

```
SqlException: The MERGE statement conflicted with the FOREIGN KEY constraint "FK_HangFire_JobParameter_Job".
The conflict occurred in database "asdf", table "HangFire.Job", column 'Id'.
The statement has been terminated.
```

I believe that this should be acceptable functionality.

Having said that, at the very least there should be a more descriptive error stating that you cannot continueWith a recurring job.

Start by reproducing the examples using RecurringJob.AddOrUpdate and BackgroundJob.ContinueWith, checking both the string and numeric job IDs. Trace how recurring-job IDs are handled and define done as either supported continuation behavior or a descriptive error explaining that recurring jobs cannot be continued.

Written by the indexing model from the issue text.