New feautures implementations

[rickypid]

After some user requests to implement new features, I thought I'd open this issue to be able to do a review and decide whether or not to implement the requests made.

1. Dynamic cell width Dynamic cell width #9
2. Filter data Filter data #3
3. Select a row select a row  #2
4. Pagination Does the flutter_expandable_table package support pagination of items? #32

[rickypid]

@RichiB20

[oleksii-pimenov]

I am just start to use ur package, but I like it already ( cuz it has expand support ) About feature request, select a row totally useless cuz it can be implemented by out own, same as filters. So I will vote for Dynamic cell

[rmasarovic]

I need somehow set same horizontal scroller for multiple indentical separate tables.