Link preview improvement

[RiccardoM]

Description

Improved posts previews fetching placing them inside the Bloc insteat of the Widget

Checklist

• [ ] Targeted PR against correct branch.
• [ ] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• [ ] Wrote unit tests.
• [ ] Run flutter format.
• [ ] Updated the documentation.
• [ ] Added an entry to the CHANGELOG.md file.
• [ ] Re-reviewed Files changed in the Github PR explorer.

[codecov[bot]]

Codecov Report

Merging #111 into master will decrease coverage by 0.10%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #111      +/-   ##
==========================================
- Coverage   17.56%   17.45%   -0.11%     
==========================================
  Files         261      262       +1     
  Lines        6456     6496      +40     
==========================================
  Hits         1134     1134              
- Misses       5322     5362      +40     

Impacted Files	Coverage Δ
lib/ui/blocs/navigator/navigator_event.dart	0.00% <ø> (ø)
lib/ui/blocs/post_details/post_details_bloc.dart	0.00% <0.00%> (ø)
lib/ui/blocs/post_details/post_details_state.dart	3.03% <ø> (ø)
lib/ui/blocs/posts_list/posts_list_bloc.dart	0.00% <0.00%> (ø)
lib/ui/blocs/posts_list/posts_list_state.dart	0.00% <0.00%> (ø)
lib/ui/models/converters/post_converter.dart	0.00% <0.00%> (ø)
lib/ui/models/link_preview.dart	0.00% <0.00%> (ø)
lib/ui/models/ui_post.dart	0.00% <0.00%> (ø)
lib/ui/screens/post_create_screen/index.dart	0.00% <ø> (ø)
...eate_screen/widgets/create_post_content/index.dart	0.00% <ø> (ø)
... and 11 more

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