feat: Add ResourceMetricsConfig for configurable core resource metrics

[Rishab87]

What this PR does / why we need it:
Implements ResourceMetricsConfig to allow users to define custom metrics for core Kubernetes resources (Pods, Deployments, etc.) via YAML configuration. This enables users to create only the metrics they need, reducing cardinality and eliminating the complexity of allowlists/denylists. The feature reuses the proven CustomResourceState metric generation system for familiar configuration syntax.

How does this change affect the cardinality of KSM: (increases, decreases or does not change cardinality)
Decreases cardinality by allowing users to define only specific metrics they need instead of all default metrics for a resource type.

Which issue(s) this PR fixes: (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged)
Fixes #2165

[k8s-ci-robot]

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[mrueg]

Just before you continue on this, it would be good to sync with @rexagod and myself as there's kubernetes/enhancements#4811 https://github.com/rexagod/resource-state-metrics out there as well :)