feat: replace deprecated Renderer by Renderer2

[aitboudad]

What kind of change does this PR introduce? feature

fixed #462

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This change is 

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[codecov-io]

Codecov Report

Merging #498 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #498   +/-   ##
=======================================
  Coverage   92.28%   92.28%           
=======================================
  Files          18       18           
  Lines         778      778           
  Branches      212      213    +1     
=======================================
  Hits          718      718           
  Misses         60       60

Impacted Files	Coverage Δ
src/core/src/components/formly.field.ts	88.59% <100%> (ø)	⬆️
src/core/src/components/formly.attributes.ts	93.02% <100%> (ø)	⬆️

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