title: mat-table - How to update the column width
body: <p>I have three columns in mat-table. </p>
  
  <p>The first column is Number, the third column is date and the second column contains a big string.</p>
  
  <p>I want the first column to be 15px, third column to be 100px and middle column rest of the width. In Percentages 5%, 85% 10%.</p>
  
  <p>How can I achieve this in mat-table?</p>