feat(http): implement body inspection handler

[RKS (rksharma-owg)]

Resolves #418

Description

This pull request implements the BodyInspectionHandler middleware and BodyInspectionHandlerOption for Kiota Python (packages/http/httpx), following the HTTP middleware specification in microsoftgraph/msgraph-sdk-design#116 and achieving parity with Kiota .NET and Kiota TypeScript.

Summary of Changes

• BodyInspectionHandlerOption:
  • Adds configuration options with inspect_request_body: bool = False and inspect_response_body: bool = False (defaulting to disabled per spec).
  • Exposes captured request and response bodies as bytes (request_body, get_request_body(), get_response_body()).
  • Provides seekable stream accessors (get_request_body_stream(), get_response_body_stream(), request_body_stream, response_body_stream) returning fresh BytesIO copies rewound to position 0.
• BodyInspectionHandler:
  • Middleware subclassing BaseMiddleware to intercept and non-destructively capture request and response bodies using await request.aread() and await response.aread().
  • Preserves payloads so subsequent middlewares and transport can consume streams without payload exhaustion.
  • Emits OpenTelemetry trace span BodyInspectionHandler_send with attribute "com.microsoft.kiota.handler.body_inspection.enable".
  • Resets captured bodies between requests when handler-level default options are used.
  • Supports per-request options override via request.options.
• KiotaClientFactory:
  • Registers BodyInspectionHandler in the default middleware pipeline following HeadersInspectionHandler.
• Tests:
  • Added unit test suite test_body_inspection_handler.py covering default options, custom options, rewound stream generation, request/response capture, streaming generators, empty payloads, disabled inspection, per-request overrides, and state reset.
  • Updated test_kiota_client_factory.py to verify pipeline registration and options handling.

Verification

• Ran full test suite in packages/http/httpx: 123 passing tests (including all 13 new body inspection tests).
• Ran type checks (mypy): 0 issues across all 26 source files.
• Code formatted with isort and yapf.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud