Add optional error_code to transaction and action traces

[arhag]

Change Description

Resolves #6898.

Rename parent_action_ordinal to closest_unnotified_ancestor_action_ordinal and remove it from the traces stored by the state history plugin.

Consensus Changes

• Consensus Changes

API Changes

• API Changes

Documentation Additions

• Documentation Additions

The new parent_action_ordinal field from PR #7044 has been renamed to closest_unnotified_ancestor_action_ordinal.

New optional field error_code has been added to action_trace and transaction_trace. This field should always be empty if the except field in the same object is empty. However, it is possible for except to be non-empty but error_code to be empty (this will be the case for any errors that were not due to the eosio_assert_code intrinsic). If error_code is non-empty, it means the error was due to an assertion failure on a call to eosio_assert_code, and the value will be the error code passed into the eosio_assert_code intrinsic.