feat(agno): adapt instrumentation for Agno 2

[sipercai]

Description

This PR updates the LoongSuite Agno instrumentation for Agno 2.x public APIs and migrates span creation to opentelemetry-util-genai ExtendedTelemetryHandler.

It adds standardized GenAI AGENT, LLM, and TOOL spans for non-streaming, streaming, async, and concurrent Agno calls, removes the old Agno 1.x extractor/span helper implementation, and adds a DashScope smoke example plus local test requirements.

Fixes # (N/A)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• tox -e precommit
• tox -c tox-loongsuite.ini -e py310-test-loongsuite-instrumentation-agno-agno
• tox -c tox-loongsuite.ini -e lint-loongsuite-instrumentation-agno

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