feat: add LinkRule linker

[SOF3]

Description

Add a new linker based on a new CRD that defines how to infer parent from the child

Related issues

Contains commits from #211

Special notes for your reviewer:

[codecov-commenter]

Codecov Report

Attention: 961 lines in your changes are missing coverage. Please review.

Comparison is base (55e101a) 17.63% compared to head (4bbb418) 16.22%.
Report is 3 commits behind head on main.

Files	Patch %	Lines
pkg/aggregator/linker/rule/linker.go	1.02%	193 Missing ⚠️
pkg/crds/apis/v1alpha1/util/util.go	0.00%	133 Missing ⚠️
pkg/crds/apis/v1alpha1/zz_generated.deepcopy.go	0.00%	106 Missing ⚠️
.../crds/client/informers/externalversions/factory.go	0.00%	96 Missing ⚠️
...lientset/versioned/typed/apis/v1alpha1/linkrule.go	0.00%	86 Missing ⚠️
...ersioned/typed/apis/v1alpha1/fake/fake_linkrule.go	0.00%	56 Missing ⚠️
pkg/crds/client/clientset/versioned/clientset.go	0.00%	47 Missing ⚠️
...ntset/versioned/typed/apis/v1alpha1/apis_client.go	0.00%	44 Missing ⚠️
...formers/externalversions/apis/v1alpha1/linkrule.go	0.00%	26 Missing ⚠️
...nt/clientset/versioned/fake/clientset_generated.go	0.00%	23 Missing ⚠️
... and 18 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #109      +/-   ##
==========================================
- Coverage   17.63%   16.22%   -1.41%     
==========================================
  Files         103      121      +18     
  Lines        9318    10241     +923     
==========================================
+ Hits         1643     1662      +19     
- Misses       7580     8484     +904     
  Partials       95       95              

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[SOF3]

lint broken due to golangci/golangci-lint#3938