feat: scaffold config dependency graph implementation

[czeslavo]

What this PR does / why we need it:

Scaffolds code for building config dependency graph:

• adds a hack/generators/config-graph code generator that outputs NewConfigGraphFromCacheStores function ensuring that we include all objects from the store in the graph
• adds a "framework" for resolving particular object types dependencies (public ResolveDependencies along with the internal resolveIngressDependencies for Ingress - leaving the rest to be implemented in separate PR(s))

Which issue this PR fixes:

Part of #5929.

PR Readiness Checklist:

Complete these before marking the PR as ready to review:

• the CHANGELOG.md release notes have been updated to reflect any significant (and particularly user-facing) changes introduced by this PR

[rainest]

Definite change request on the units having multiple expected children for one to many dependency relationships, maybe change request on the template approach.

---

If we do need templates: my kingdom for Github/editors having the ability to syntax highlight templated Go code and my not needing to copy it into something else and remove the string delimiters. How do we not have a

// syntaxhint:go
`// Code generated by hack/generators/config-graph; DO NOT EDIT.
package fallback
import (
	"errors"
...
`

that understands "oh, Go with templating occasionally, use (mostly) Go syntax highlighting rules" instead of magic AI code writing assistants? I want to read code more quickly, not write code more quickly, damnit.

[codecov]

Codecov Report

Attention: Patch coverage is 87.87879% with 20 lines in your changes are missing coverage. Please review.

Project coverage is 73.1%. Comparing base (6e16f27) to head (ed8b7a1).

❗ Current head ed8b7a1 differs from pull request most recent head 8df360c. Consider uploading reports for the commit 8df360c to get more accurate results

Files	Patch %	Lines
internal/dataplane/fallback/graph.go	66.6%	6 Missing and 6 partials ⚠️
...l/dataplane/fallback/graph_dependencies_ingress.go	88.4%	4 Missing and 2 partials ⚠️
internal/dataplane/fallback/graph_dependencies.go	92.8%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           main   #6010      +/-   ##
=======================================
+ Coverage      0   73.1%   +73.1%     
=======================================
  Files         0     188     +188     
  Lines         0   18513   +18513     
=======================================
+ Hits          0   13539   +13539     
- Misses        0    4034    +4034     
- Partials      0     940     +940     

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[rainest]

Think we're clear here, approving without merging in case there's anything further @programmer04 wanted to wrap up in #6010 (comment)