Extend AIM template common fields with engine, profile ID and fallback

[salexo]

The common fields in AIM(Cluster)ServiceTemplate should be extended to support all high-level environment variables of AIMs that affect profile selection:

Existing:

• AIM_METRIC - spec.metric
• AIM_PRECISION - spec.precision
• AIM_GPU_COUNT - spec.gpuSelector.count
• AIM_GPU_MODEL - spec.gpuSelector.model

New:

• AIM_ENGINE - spec.engine: *string
• AIM_PROFILE_ID - spec.profileId: *string
• AIM_ALLOW_GENERAL_PROFILE_FALLBACK - spec.allowGeneralProfileFallback: *boolean

If the fields are unset, they are not added to the AIM container.