run abstract method
Starts a mutation and set its state based on the result of the callback.
This sets the mutation state to MutationPending, call the callback, then set the mutation state to either MutationSuccess or MutationError depending on whether the callback completes successfully or throws an error.
Implementation
Future<ResultT> run(
MutationTarget target,
Future<ResultT> Function(MutationTransaction tsx) cb,
);