Add schemas for missing rc associated methods

Mateusz Kudelarequested to merge
mkudela/schemas_for_missing_condenser_tests into master

Schemas for three missing methods from condenser API:

  • find_rc_accounts
  • list_rc_direct_delegation
  • list_rc_accounts

Corresponding hive merge request: hive!754 (merged)

Edited by Michał Kudela

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