Also known as hints based auto-discovery for agent standalone
Picking up context from elastic/beats#23876

We want to enable users to monitor Kubernetes workloads from the resource side for users of agent standalone.

User outcome
Kubernetes users can declare their workloads and include hints, similar to those described in beats documentation metricbeat and filebeat manifests and then expect agent whilst enrolled in standalone mode to pick these hints launch the proper config for it.

Acceptance criteria
On top of the outcome described above

• Application operator (developer) should have an accessible way to find the list of available hints
• Application operator (developer) should receive feedback for when a hint is not valid

Implementation issues

• Add support for template construction compatible with kubernetes hints: Add support for template construction compatible with kubernetes hints kibana#135624 will be implemented in CI jobs
• Add support for hints' based autodiscovery in kubernetes provider #662
• Documentation issue: Add hints based autodiscover part observability-docs#2182