feat: add CEL metrics tracking for expression evaluations (work in progress)

[govindup63]

• Introduced CELMetrics struct to track total cost and cost per resource.
• Implemented methods to record, reset, and retrieve CEL metrics in ResourceGraphDefinitionRuntime.
• Updated expression evaluation methods to track costs during evaluations.
• Enhanced instance status preparation to include CEL metrics in the status map.
• Added comprehensive tests for CEL metrics functionality and cost tracking in various scenarios

#190

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