refactor(ui): restructure stream svg icons

[xsahil03x]

This pull request includes several changes to the stream_chat_flutter package to improve the handling of SVG icons and update asset paths. The most important changes include refactoring the StreamSvgIcon usage, updating image asset paths, and importing the correct icon files.

Improvements to SVG icon handling:

• packages/stream_chat_flutter/example/lib/main.dart: Updated the StreamSvgIcon usage to use the new StreamSvgIcons enum for the reply icon.
• packages/stream_chat_flutter/lib/src/attachment/attachment_upload_state_builder.dart: Refactored multiple instances of StreamSvgIcon to use the new StreamSvgIcons enum for close, retry, and check icons. [1] [2] [3] [4]
• packages/stream_chat_flutter/lib/src/attachment/file_attachment.dart: Updated StreamSvgIcon usage to use the new StreamSvgIcons enum for cloudDownload, close, check, and retry icons. [1] [2] [3]

Updating image asset paths:

• packages/stream_chat_flutter/lib/src/attachment/thumbnail/giphy_attachment_thumbnail.dart: Changed image asset path from images/placeholder.png to lib/assets/images/placeholder.png.
• packages/stream_chat_flutter/lib/src/attachment/thumbnail/image_attachment_thumbnail.dart: Updated the placeholder image asset path.
• packages/stream_chat_flutter/lib/src/attachment/thumbnail/video_attachment_thumbnail.dart: Updated the placeholder image asset path in two locations. [1] [2]
• packages/stream_chat_flutter/lib/src/attachment/thumbnail/thumbnail_error.dart: Updated the placeholder image asset path.

Correcting icon file imports:

• packages/stream_chat_flutter/lib/src/attachment/file_attachment.dart: Corrected the import path for stream_svg_icon.dart.

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[codecov]

Codecov Report

Attention: Patch coverage is 60.56338% with 56 lines in your changes missing coverage. Please review.

Project coverage is 59.89%. Comparing base (7ed1709) to head (d212dba).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...at_flutter/lib/src/attachment/file_attachment.dart	22.22%	7 Missing ⚠️
...am_chat_flutter/lib/src/icons/stream_svg_icon.dart	64.28%	5 Missing ⚠️
...ottom_sheets/stream_channel_info_bottom_sheet.dart	0.00%	4 Missing ⚠️
...rc/attachment/attachment_upload_state_builder.dart	25.00%	3 Missing ⚠️
...ib/src/message_input/quoting_message_top_area.dart	0.00%	3 Missing ⚠️
...chment_actions_modal/attachment_actions_modal.dart	66.66%	2 Missing ⚠️
.../attachment_picker/options/stream_file_picker.dart	0.00%	2 Missing ⚠️
...attachment_picker/options/stream_image_picker.dart	0.00%	2 Missing ⚠️
...attachment_picker/options/stream_poll_creator.dart	0.00%	2 Missing ⚠️
...attachment_picker/options/stream_video_picker.dart	0.00%	2 Missing ⚠️
... and 24 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2094      +/-   ##
==========================================
- Coverage   60.15%   59.89%   -0.26%     
==========================================
  Files         372      372              
  Lines       22773    22730      -43     
==========================================
- Hits        13699    13615      -84     
- Misses       9074     9115      +41     

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[deven98]

LGTM