In the new patternfly/react-data-view extension, implement the layout aspects of the new DataView component. In particular:

DataView component that accepts 2 layout props:

• header
• footer

Enable displaying the data section using children.

At the same time, prepare a default implementation for DataViewHeader and DataView footer, which will be enhanced later. Use all the components in an example and update the docs.

See https://docs.google.com/document/d/1IuF8uF-AJjvPmRM3ik5WGEJWESplZa9pxlafrA9kxtc/edit?usp=sharing for more details