Add Tags in _Split Transaction_ screen

[wolfsolver]

          The _Split Transaction_ screen still only shows the three standard fields - _Category_, _Amount_ and _Notes_, like this:  

Please add the new Tags field to this Split Transaction screen so that each item in a split transaction can be assigned one or more different tags, like this:

Originally posted by @luisdev in #735 (comment)

[MisterEco]

It will be nice to have such option!

[froux07]

Yes, very good idea. Because the search by tag, does not retrieve split transactions
👍