function getLeftMostTypeName(node) {
    if (node.name) return node.name;
    if (node.left) return getLeftMostTypeName(node.left);
  }
Returns the left most typeName of a node, e.g: FC<Props>, React.FC<Props>
The representation is used to verify nested used properties.
@param {ASTNode} node
@return {string | undefined}