* feat: implement oracle instance

* Go

* Remove key

* Go

* Add instance id, fix conditional deser

* Go

* Rename

* Revert changes to cli

* Checkpoint

* Cleanup deps

* Refactor tests

* Cleanup deps

* Write test

* Fix comment

* Shard id

* ADd tests

* Extract common test utils

* Fix test

* Better name

* Cleanup

* Instance -> shard

* Update test

* Make shard id a u16