feat(pf4): add support for submit errors

[rvsia]

Part of #922

Description

Implements submitErrors support for PF4 mapper. (I will add the support for other mappers in a batch as fixes, this is made separately to provide it to our community ASAP)

Schema (if applicable)

onSubmit={() => ({field: 'some error message'})}

[codecov]

Codecov Report

Merging #924 (ca5aa83) into master (ebbc471) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #924   +/-   ##
=======================================
  Coverage   93.39%   93.40%           
=======================================
  Files         235      235           
  Lines        3695     3699    +4     
  Branches     1222     1225    +3     
=======================================
+ Hits         3451     3455    +4     
  Misses        244      244           

Impacted Files	Coverage Δ
...ages/pf4-component-mapper/src/common/form-group.js	100.00% <100.00%> (ø)
...ages/pf4-component-mapper/src/common/show-error.js	100.00% <100.00%> (ø)
...ages/pf4-component-mapper/src/files/field-array.js	100.00% <100.00%> (ø)

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[Hyperkid123]

🎉 This PR is included in version 2.19.0 🎉

The release is available on

• react-form-renderer (@latest dist-tag)

• pf3-component-mapper (@latest dist-tag)

• pf4-component-mapper (@latest dist-tag)

• mui-component-mapper (@latest dist-tag)

Demo can be found here!