Added Support For separatorBuilder

[thechinkysight]

• Added support for ListView.separated(), use PaginableListView.separated() which is the paginable's version of ListView.separated()
• Added support for separatorBuilder to PaginableSliverChildBuilderDelegate, use PaginableSliverChildBuilderDelegate().separated() which is like ListView.separated()
• Deprecated the PaginableListViewBuilder, use PaginableListView.builder() instead.

[codecov[bot]]

Codecov Report

Merging #22 (ec16d61) into main (660f631) will increase coverage by 0.05%. The diff coverage is 98.52%.

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
+ Coverage   98.48%   98.54%   +0.05%     
==========================================
  Files           5        5              
  Lines         132      206      +74     
==========================================
+ Hits          130      203      +73     
- Misses          2        3       +1     

Impacted Files	Coverage Δ
lib/src/paginable_custom_scroll_view.dart	98.03% <ø> (ø)
lib/src/paginable_listview.dart	97.97% <97.97%> (ø)
...b/src/paginable_sliver_child_builder_delegate.dart	100.00% <100.00%> (ø)

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