[new feature] NumberKeyboard: add delete slot

[chenjiahan]

No description provided.

[codecov-io]

Codecov Report

Merging #3499 into dev will increase coverage by 0.13%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             dev    #3499      +/-   ##
=========================================
+ Coverage   92.6%   92.73%   +0.13%     
=========================================
  Files        117      117              
  Lines       2584     2589       +5     
  Branches     223      223              
=========================================
+ Hits        2393     2401       +8     
+ Misses       168      165       -3     
  Partials      23       23

Impacted Files	Coverage Δ
packages/number-keyboard/index.js	100% <100%> (+2.85%)	⬆️
packages/number-keyboard/Key.js	100% <100%> (+20%)	⬆️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6394507...9737775. Read the comment docs.

[codecov-io]

Codecov Report

Merging #3499 into dev will increase coverage by 0.13%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             dev    #3499      +/-   ##
=========================================
+ Coverage   92.6%   92.73%   +0.13%     
=========================================
  Files        117      117              
  Lines       2584     2589       +5     
  Branches     223      223              
=========================================
+ Hits        2393     2401       +8     
+ Misses       168      165       -3     
  Partials      23       23

Impacted Files	Coverage Δ
packages/number-keyboard/index.js	100% <100%> (+2.85%)	⬆️
packages/number-keyboard/Key.js	100% <100%> (+20%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6394507...9737775. Read the comment docs.