fix: indent padding from left when rtl

[zoli]

Also introduced last direction concept.

/cc @LucasXu0 These are changes from what we discussed before in Discord.
I tried to add at least one test for each change that I made, With one exception which I've commented on here.

[codecov]

Codecov Report

Merging #318 (5054f69) into main (0249d41) will increase coverage by 2.39%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #318      +/-   ##
==========================================
+ Coverage   73.02%   75.42%   +2.39%     
==========================================
  Files         236      236              
  Lines        9477     9481       +4     
==========================================
+ Hits         6921     7151     +230     
+ Misses       2556     2330     -226     

Impacted Files	Coverage Δ
...block_component/bulleted_list_block_component.dart	91.89% <ø> (-0.52%)	⬇️
...block_component/numbered_list_block_component.dart	92.20% <ø> (+5.62%)	⬆️
...ent/text_block_component/text_block_component.dart	98.03% <ø> (-0.18%)	⬇️
...ist_block_component/todo_list_block_component.dart	86.07% <ø> (-0.83%)	⬇️
...component/base_component/text_direction_mixin.dart	100.00% <100.00%> (ø)
...onent/service/renderer/block_component_widget.dart	83.78% <100.00%> (+3.13%)	⬆️

... and 23 files with indirect coverage changes