additional attributes for column (table header)

[devsrv]

Sometimes it is useful to use some additional attributes for the table header, for example if the column name is too long we may limit the string character & display a tooltip when hover.

users can add additional attributes as:

Column::make('Candidate', 'fname')
->addClass('foobar')
->addAttributes(['data-toggle' => 'tooltip', 'data-placement' => 'top', 'title' => 'Tooltip on top'])

with the addition of addAttributes() method the addClass() method becomes useless but for backward compatibility this can be removed on future major release.