feat: add command and keybinds to delete line

[panekj]

• Added an entry to CHANGELOG.md if this change could be valuable to users

Fixes #1966

[codecov-commenter]

Codecov Report

Merging #2071 (c8bb960) into master (0ae86e6) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

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@@            Coverage Diff            @@
##           master   #2071      +/-   ##
=========================================
- Coverage    9.00%   9.00%   -0.01%     
=========================================
  Files         135     135              
  Lines       58822   58837      +15     
=========================================
+ Hits         5295    5296       +1     
- Misses      53527   53541      +14     

Impacted Files	Coverage Δ
lapce-core/src/command.rs	0.00% <ø> (ø)
lapce-core/src/editor.rs	29.31% <0.00%> (-0.33%)	⬇️
lapce-data/src/keypress/keypress.rs	73.23% <0.00%> (+0.20%)	⬆️

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