opentelemetry-util-genai: add support for emitting inference events and enrich message types (#3994)

* Add support for emitting inference events and enrich message types

Change-Id: I8fd0b896fc103a986f78c7351ce627611e545a62
Co-developed-by: Cursor <noreply@cursor.com>

* Add change log

Change-Id: I5c4c93613e3e1084245b7298955a08cbc7c9708d
Co-developed-by: Cursor <noreply@cursor.com>

* Fix unit tests

Change-Id: If34cfce0e7eb130db6a1e8e30a5f4be7c215285f
Co-developed-by: Cursor <noreply@cursor.com>

* Fix linting failure

Change-Id: I847f75259e01729db88129a44b241afb0ea2aca4
Co-developed-by: Cursor <noreply@cursor.com>

* Fix readme

Change-Id: I818a042d275d3c8e3348647d73e34560e7d92f54
Co-developed-by: Cursor <noreply@cursor.com>

* Format codes

Change-Id: I40b8e01bbe4fa9c182e99085a7c71d4536042247
Co-developed-by: Cursor <noreply@cursor.com>

* Fix missing trace context in events

Change-Id: Ie07c495002143fb2f0cf88033206290eb85386ad
Co-developed-by: Cursor <noreply@cursor.com>

* feedback

Change-Id: Ida0c2305d950d978c31eb04a80e21e947fabdfba
Co-developed-by: Cursor <noreply@cursor.com>

* fix type check

Change-Id: I1da48b52b76042a9efd124057681f579cc93fb6e
Co-developed-by: Cursor <noreply@cursor.com>

* Fix the span name of LLM invocations

Change-Id: I1b9f40e5576e699b1f61fa3d7e7790ee4b1448a5
Co-developed-by: Cursor <noreply@cursor.com>

* Fix span name

Change-Id: I7adf6fc9cf0bcbed3927862ff87d441bb2a1f78b
Co-developed-by: Cursor <noreply@cursor.com>

* Fix operation name of llm span

Change-Id: I4a6f48d0f66b8ad00a6ce4be8dcf4a46aba68e33
Co-developed-by: Cursor <noreply@cursor.com>

* Adjust event emission switches to optimize the integration experience

Change-Id: Ied7182fe2f3493a1eba96d7eaae5fd1b790c16e7
Co-developed-by: Cursor <noreply@cursor.com>

* Resolve conflicts

Change-Id: I95472013fe59b2b7a7448bb4374fe103021ec8a1
Co-developed-by: Cursor <noreply@cursor.com>

* Fix lint error

Change-Id: I78008c9b812d81a705eb7e7c75bd622b47d9da5a
Co-developed-by: Cursor <noreply@cursor.com>

* Refactor span_utils.py to streamline attribute collection

Change-Id: I243cc757454c085818d621011435076bf501108d
Co-developed-by: Cursor <noreply@cursor.com>

* Fix the lint error

Change-Id: If8bfaf1fde5594f7918c195243db9ec83f156156
Co-developed-by: Cursor <noreply@cursor.com>

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Co-authored-by: Aaron Abbott <aaronabbott@google.com>