Add endpoints (#504)

* Update auctions current to use offset to key into Winning

* MVP leases current

* Add paras service

* Add /paras to controller

* Update doc comments

* Add retirement end

* Add response interfaces

* Add interfaces for leases, para, and auctions

* Add doc comment to interface

* Exclude lease-info for indexs with no lease

* Remove retirement period end bc no longer have retirements

* Address tarik review comment

* Apply suggestions from code review

Co-authored-by: Tarik Gul <[email protected]>

Co-authored-by: Tarik Gul <[email protected]>