feat: rename delta and document

[LucasXu0]

No description provided.

[codecov]

Codecov Report

Merging #153 (de5ca27) into main (6b5d48c) will decrease coverage by 0.05%.
The diff coverage is 57.14%.

@@            Coverage Diff             @@
##             main     #153      +/-   ##
==========================================
- Coverage   57.70%   57.66%   -0.05%     
==========================================
  Files         211      211              
  Lines        9526     9516      -10     
==========================================
- Hits         5497     5487      -10     
  Misses       4029     4029              

Impacted Files	Coverage Δ
lib/src/core/document/document.dart	81.81% <ø> (ø)
lib/src/editor/toolbar/items/color/color_menu.dart	0.00% <0.00%> (ø)
...lbar/items/color/highlight_color_toolbar_item.dart	0.00% <0.00%> (ø)
...r/toolbar/items/color/text_color_toolbar_item.dart	0.00% <0.00%> (ø)
lib/src/extensions/attributes_extension.dart	100.00% <ø> (ø)
lib/src/infra/html_converter.dart	49.70% <ø> (ø)
lib/src/plugins/html/html_document_decoder.dart	0.00% <0.00%> (ø)
...r/editor_component/entry/page_block_component.dart	75.00% <50.00%> (ø)
lib/src/core/document/node.dart	97.65% <100.00%> (ø)
lib/src/render/rich_text/flowy_rich_text.dart	88.52% <100.00%> (+1.09%)	⬆️
... and 1 more