feat(openinference-core): decorators

[mikeldking]

resolves #2228

Added tracing capabilities with decorators and function

• Function Wrapping: withSpan(), withAgentSpan(), withToolSpan(), withChainSpan()
• Decorators: @observe() for class methods

Examples

Function Wrapping:

const tracedLLM = withAgentSpan(callOpenAI, {
  attributes: { 'llm.model': 'gpt-4' }
});

Decorators:

class Agent {
  @trace({ kind: OpenInferenceSpanKind.AGENT })
  async makeDecision(context) { /* ... */ }
}

Custom Processing:

const traced = withSpan(fn, {
  attributes: { 'service.name': 'my-service' },
  processInput: (...args) => ({ 'input.count': args.length })
});

• mime type inference
• async function support
• error propagation
• chain
• agent
• tool

[pkg-pr-new]

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@arizeai/openinference-core

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commit: 9abe364

[mikeldking]

this is to avoid collision with otel's trace api

[mikeldking]

This name seems semantic but maybe we could alias observeFunction or something like that....