GenAI Utils | Initial Helpers for Inference

[keith-decker]

Description

The GenAI Utils package will include boilerplate and helpers to standardize instrumentation for Generative AI.
This PR provides APIs to minimize the work needed to instrument genai libraries. It provides helpers for starting and stopping LLM invocations, it generates spans aligned with semconvs.

Metrics and Events to come on future PRs

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Basic unit test for starting and stopping LLM - Spans
• Unit test for parent/child invocations

Does This PR Require a Core Repo Change?

• Yes. - Link to PR:
• No.

Checklist:

See contributing.md for styleguide, changelog guidelines, and more.

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated

[aabmass]

Looks very similar to #3718 @DylanRussell

[DylanRussell]

Would it be possible to break the PR up a bit ? It's kind of large. Maybe we can agree on the types in 1 PR. Even still it's a bit large

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[keith-decker]

Creating a new PR - a merge in our working repo polluted this git history.

#3768