fix(renderer): add buttonType to form controls

[rvsia]

• allows to customize each button depending on its type (submit, cancel, reset)

prop	type	desc	value	customization
buttonType	string	Depends on the type button	One of 'submit', 'cancel', 'reset'	No

• also use link for PF4's cancel button

[codecov]

Codecov Report

Merging #394 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #394      +/-   ##
==========================================
+ Coverage   91.64%   91.64%   +<.01%     
==========================================
  Files         100      100              
  Lines        2034     2035       +1     
  Branches      672      673       +1     
==========================================
+ Hits         1864     1865       +1     
  Misses        170      170

Impacted Files	Coverage Δ
...ponent-mapper/src/form-fields/layout-components.js	92.3% <100%> (ø)	⬆️
...ponent-mapper/src/form-fields/layout-components.js	100% <100%> (ø)	⬆️
...t-form-renderer/src/form-renderer/form-controls.js	100% <100%> (ø)	⬆️
...ponent-mapper/src/form-fields/layout-components.js	66.66% <100%> (ø)	⬆️

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[Hyperkid123]

🎉 This PR is included in version 1.30.1 🎉

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!