Add the normalizer that makes use of well-known types

[sbose78]

• [x] Tests successful
• [ ] Generation of well-known types
• [x] Does this break any API compatibility? probably not.
• [x] Does this take care of exposing only those functions which are needed to expose? yes

partially https://github.com/argoproj/gitops-engine/issues/178

[sonarqubecloud[bot]]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
7 Code Smells

No Coverage information
6.5% Duplication

[codecov[bot]]

Codecov Report

Merging #250 (ce1cc12) into master (89ddd0d) will increase coverage by 5.83%. The diff coverage is 95.15%.

@@            Coverage Diff             @@
##           master     #250      +/-   ##
==========================================
+ Coverage   49.87%   55.71%   +5.83%     
==========================================
  Files          40       43       +3     
  Lines        3186     3658     +472     
==========================================
+ Hits         1589     2038     +449     
- Misses       1437     1449      +12     
- Partials      160      171      +11     

Impacted Files	Coverage Δ
pkg/diff/diff.go	62.57% <ø> (-0.22%)	:arrow_down:
pkg/diff/normalizer.go	50.00% <50.00%> (ø)
pkg/diff/normalizer/knowntypes/normalizer.go	59.25% <59.25%> (ø)
pkg/diff/diff_options.go	83.33% <100.00%> (ø)
...g/diff/normalizer/knowntypes/corev1_known_types.go	100.00% <100.00%> (ø)

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