Adds an {@link Acceptor} to the collection of acceptors if it doesn'texists. Existence of an acceptor is determined by the {@link Acceptor#equals(Object)} method.
@param acceptor the {@link Acceptor} instance to be added.
@return the {@link ConnectorService} instance (fluent API).
@throws IllegalArgumentException if the acceptor is null.
@throws ObjectAlreadyExistsException if the acceptor already exists.
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