Add form alerts and add implementation for PF4

[rvsia]

Part of #923

Description

Adds BeforeError component to common FormTemplate.

Adds alertProps to common FormTemplate.

Adds implementation of the Alert for PF4 mapper (based on guidelines)

Reexports FORM_ERROR as FormError in the renderer package.

Schema (if applicable)

    validate={({something}) => {
        if(something?.length > 3) {
            return {[FormError]: 'too long'}
        }

        if(something) {
            return {[FormError]: 'too short'}
        }

        return {}
    }}

[codecov]

Codecov Report

Merging #1059 (6567210) into master (a7f73ec) will decrease coverage by 0.09%.
The diff coverage is 64.28%.

@@            Coverage Diff             @@
##           master    #1059      +/-   ##
==========================================
- Coverage   85.31%   85.22%   -0.10%     
==========================================
  Files         202      202              
  Lines        3391     3404      +13     
  Branches     1168     1173       +5     
==========================================
+ Hits         2893     2901       +8     
- Misses        498      503       +5     

Impacted Files	Coverage Δ
packages/common/src/form-template/form-template.js	0.00% <0.00%> (ø)
...omponent-mapper/src/form-template/form-template.js	100.00% <100.00%> (ø)

---

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 9b9c524...6567210. Read the comment docs.

[Hyperkid123]

🎉 This PR is included in version 3.7.0 🎉

The release is available on

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

Demo can be found here!