feat(core, ui): add grid views, minor refactoring

[xsahil03x]

No description provided.

[codecov]

Codecov Report

Merging #1109 (51a3711) into v4 (38ace99) will decrease coverage by 0.49%.
The diff coverage is 1.99%.

@@            Coverage Diff             @@
##               v4    #1109      +/-   ##
==========================================
- Coverage   68.34%   67.84%   -0.50%     
==========================================
  Files         218      227       +9     
  Lines       23244    23407     +163     
==========================================
- Hits        15885    15880       -5     
- Misses       7359     7527     +168     

Impacted Files	Coverage Δ
...src/v4/message_input/stream_attachment_picker.dart	33.18% <ø> (ø)
.../channel_scroll_view/stream_channel_grid_tile.dart	0.00% <0.00%> (ø)
.../channel_scroll_view/stream_channel_grid_view.dart	0.00% <0.00%> (ø)
.../channel_scroll_view/stream_channel_list_tile.dart	0.00% <ø> (ø)
.../channel_scroll_view/stream_channel_list_view.dart	1.36% <0.00%> (ø)
...h_scroll_view/stream_message_search_grid_view.dart	0.00% <0.00%> (ø)
...h_scroll_view/stream_message_search_list_tile.dart	0.00% <ø> (ø)
...h_scroll_view/stream_message_search_list_view.dart	1.66% <0.00%> (ø)
...4/scroll_view/stream_scroll_view_empty_widget.dart	0.00% <0.00%> (ø)
...4/scroll_view/stream_scroll_view_error_widget.dart	0.00% <0.00%> (ø)
... and 11 more

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