Python: Improve DevUI, add Context Inspector view as new tab under traces

[victordibia]

Motivation and Context

This PR adds a new Context Inspector feature to DevUI for visualizing token usage and context composition, along with comprehensive TypeScript type safety improvements to address any type errors across the frontend codebase.

Context Inspector

A new tab in the Debug Panel that provides:

• Token Usage Visualization: Stacked bar chart showing input/output tokens per turn
• Context Composition View: Breakdown of what fills the context (system prompts, user messages, assistant responses, tool calls)
• Per-turn vs Cumulative Modes: Toggle between viewing individual turn usage or accumulated context
• Summary Statistics: Total tokens, average per turn, peak usage
• Pure CSS Implementation: No external charting library dependencies

Tracing Improvements

• Added NoOp exporters (NoOpSpanExporter, NoOpLogExporter, NoOpMetricExporter) to prevent console spam when tracing is enabled locally without an OTLP endpoint
• Changed trace grouping from session_id to response_id for better per-turn organization
• Added trace attributes type definitions for proper TypeScript support

Type Safety Improvements

Addressed 36 @typescript-eslint/no-explicit-any errors by adding proper types:
Fixed React Rules of Hooks violations in OpenAIContentRenderer.tsx by moving hooks before early returns.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the Contribution Guidelines
• All unit tests pass, and I have added new tests where possible
• Is this a breaking change? If yes, add "[BREAKING]" prefix to the title of the PR.

[markwallace-microsoft]

Python Test Coverage Report •

File	Stmts	Miss	Cover	Missing
TOTAL	16283	2546	84%

report-only-changed-files is enabled. No files were changed during this commit :)

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
2324	130 💤	0 ❌	0 🔥	1m 2s ⏱️