feat: Support markdown to bold text

[tekdel]

To bold text, add two asterisks or underscores before and after a word or phrase. To bold the middle of a word for emphasis, add two asterisks without spaces around the letters.

out.mp4

Reference:
#1099

[tekdel]

I'm not sure what should be here, could you advise with that?

[LucasXu0]

The minus is fine. Since I often encountered some error reports, like flutter/flutter#96022, when simulating keyboard pressing in the test before, I didn't use the Flutter built-in keyboard testing function directly but passed the keyboard event to the keyboard_service. The mock keyboard events need to correspond to the logical keys and physical keys, so there is no problem to use minus here.

[codecov-commenter]

Codecov Report

Merging #1187 (1841fb2) into main (06f1d52) will increase coverage by 0.25%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1187      +/-   ##
==========================================
+ Coverage   78.46%   78.71%   +0.25%     
==========================================
  Files         105      106       +1     
  Lines        5229     5291      +62     
==========================================
+ Hits         4103     4165      +62     
  Misses       1126     1126              

Impacted Files	Coverage Δ
...itor/lib/src/document/built_in_attribute_keys.dart	100.00% <ø> (ø)
...ndlers/markdown_syntax_to_styled_text_handler.dart	100.00% <100.00%> (ø)
...rvice/shortcut_event/built_in_shortcut_events.dart	97.64% <100.00%> (+0.11%)	⬆️

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