Implement StorageConnectionExtensions.GetRecurringJob(string id)

There is currently no efficient way to get a single recurring job DTO by it's id. StorageConnectionExtensions.GetRecurringJobs returns all recurring jobs but it will become unpractical to call in case if number of recurring jobs is large (thousands).

Please add StorageConnectionExtensions.GetRecurringJob(string id) method to get a recurring job DTO by it's id.

Start by reading StorageConnectionExtensions.GetRecurringJobs and the storage connection APIs it uses. Add the requested GetRecurringJob(string id) entry point so it retrieves one recurring job DTO efficiently by ID, then verify that the result matches the existing recurring-job data shape.

Written by the indexing model from the issue text.