fix(type): catch internal promise rejections

[ph-fritsche]

What:

Fix UncaughtPromiseRejectionWarning for synchronous userEvent.type() that previously slipped through out catch.
Promise rejections are reported per console.error.

Asynchronous calls remain unaffected. Users can and have to handle promise rejections themselves.

Also includes an improved error message for undefined characters and adds test coverage for the error messages.

Why:

Close #633

How:

Return the internal promise if it is not awaited.

Checklist:

• N/A Documentation
• Tests
• Ready to be merged

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[codecov]

Codecov Report

Merging #635 (bde25bc) into master (54a10f5) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #635   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           49        49           
  Lines          911       917    +6     
  Branches       361       363    +2     
=========================================
+ Hits           911       917    +6     

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

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[github-actions]

🎉 This PR is included in version 13.1.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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