title: Is there a Property for the array of el-table-column in el-table
body: <p>Looking at the documentation for ElementUI table here: <a href="http://element.eleme.io/#/en-US/component/table" rel="nofollow noreferrer">http://element.eleme.io/#/en-US/component/table</a> there is no evidence of a property for the array / collection of columns.</p>
  
  <p>In elementUI table there is the data property to bind the data array but I want to do something similar with the el-table-column array. </p>
  
  <p>What I want is to be able to add columns in a way similar to the way bootstrap-vue does it by being able to bind a separate array of column configuration to the table.</p>