Add clockwork to schedule tasks

[#62482050]

Signed-off-by: Abhijit Hiremagalur <abhi@pivotallabs.com>
Prefer new allow syntax for consistency

[#62482050]

Signed-off-by: Abhijit Hiremagalur <abhi@pivotallabs.com>
Split up Rakefile into smaller files

Each top-level namespace has a corresponding .rake file in lib/tasks like Rails.

Signed-off-by: Abhijit Hiremagalur <abhi@pivotallabs.com>
Endpoint to clear AppUsageEvent data and seed it with currently running
apps

[finishes #62853656]

Signed-off-by: Joseph Palermo <jpalermo@pivotallabs.com>