Implement view external size calculations

This patch adds calculations to show the external size of user defined
data in views which is a rough measure of how much disk space it would
take to store the keys, values, and reductions. This can be used for
capacity planning and calculating relative compression ratios.

2 files changed
tree: 7627975275b083a09cb1c36faf0082880d27336c
  1. include/
  2. src/
  3. test/