default void importSymbol(Symbol symbol) {
        importSymbol(symbol, symbol.getName());
    }
Adds an import for the given symbol if and only if the "namespace" of the
provided Symbol differs from the "namespace" associated with the
ImportContainer.

@param symbol The symbol to import.
@see #importSymbol(Symbol, String)
smithy-codegen-core/src/main/java/software/amazon/smithy/codegen/core/ImportContainer.java