fix: set KeyboardEvent.charCode on keypress

[ph-fritsche]

What:

Set KeyboardEvent.charCode when dispatching keypress.

Why:

React does not create Synthetic keypress events if charCode is not set.

Closes #766

Checklist:

• Tests
• Ready to be merged

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Sandbox	Source
userEvent-PR-template	Configuration
loving-neumann-e6fi9	Issue #766

[codecov]

Codecov Report

Merging #771 (d87b0c9) into alpha (5434f3f) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             alpha      #771   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           64        64           
  Lines         1303      1304    +1     
  Branches       504       505    +1     
=========================================
+ Hits          1303      1304    +1     

Impacted Files	Coverage Δ
src/keyboard/keyboardImplementation.ts	100.00% <100.00%> (ø)

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[github-actions]

🎉 This PR is included in version 14.0.0-alpha.5 🎉

The release is available on:

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• GitHub release

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