title: Kusto: How to convert columns to rows and summarize by them
body: <p>I have a table like this: -</p>
  <pre><code>Type | shown | eaten  |
  -----------------------
  a    |  5    |   2    |
  b    |  6    |   23   |
  c    |  8    |   12   |
  d    |  19   |   11   |
  e    |  2    |   22   |
  -----------------------
  </code></pre>
  <p>I want to convert it like this: -</p>
  <pre><code>Type | action | count |
  -----------------------
  a    | shown  |  5    |
  a    | eaten  |  2    |
  b    | shown  |  6    |
  b    | eaten  |  23   |
  c    | shown  |  8    |
  c    | eaten  |  12   |
  d    | shown  |  19   |
  d    | eaten  |  11   |
  e    | shown  |  2    |
  e    | eaten  |  22   |
  -----------------------
  </code></pre>
  <p>How to write a kql query for this?</p>