Add GenAI main-agent attribution processors

[rads-1996]

Add GenAI main-agent attribution processors to propagate microsoft.gen_ai.main_agent.* attributes in multi-agent systems. Implements spec.

[Copilot]

Pull request overview

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Adds GenAI “main-agent” attribution propagation so spans and logs carry microsoft.gen_ai.main_agent.* attributes throughout multi-agent traces, per the referenced spec.

Changes:

• Introduces span + log record processors to propagate main-agent attribution from parent spans and into log records.
• Wires the processors into the distro initialization so they run by default (unless tracing/logging disabled).
• Adds constants and unit tests covering propagation and lifecycle no-ops.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/microsoft/opentelemetry/_genai/main_agent/_processor.py	Implements the span/log processors that propagate microsoft.gen_ai.main_agent.* attributes
src/microsoft/opentelemetry/_genai/main_agent/__init__.py	Exposes the new processors as a package API
src/microsoft/opentelemetry/_distro.py	Registers the processors by default in the distro configuration
src/microsoft/opentelemetry/_constants.py	Adds new microsoft.gen_ai.main_agent.* attribute key constants
tests/genai/main_agent/test_span_processor.py	Adds tests for span propagation and self-copy behavior
tests/genai/main_agent/test_log_record_processor.py	Adds tests for log record enrichment from current span

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