Context

Implement an RPC for getting the full list of tickets owned by a contract by scanning it's storage. Part of #3625 (closed).

CLI will be added in a separate MR.

See the section "2. RPC/CLI for the ticket balance of a ticket-token and account" in the design doc for the specs: https://hackmd.io/@marigold-dev/SyLXJQcJs

Manually testing the MR

Document the interface of any function added or modified (see the coding guidelines)
Document any change to the user interface, including configuration parameters (see node configuration)
Provide automatic testing (see the testing guide).
For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
Select suitable reviewers using the Reviewers field below.
Select as Assignee the next person who should take action on that MR

Edited Nov 08, 2022 by Lin Oshitani