Added secure traffic access

[mishushakov]

Note

Add E2B-Traffic-Access-Token header support to JS/Python clients and introduce secure-traffic test suites with sandbox factory/setup updates.

• SDK clients:
  • JS (js/src/sandbox.ts): Send E2B-Traffic-Access-Token (when present) with runCode and context APIs (/contexts, /contexts/:id, /contexts/:id/restart); standardize headers.
  • Python (code_interpreter_async.py, code_interpreter_sync.py): Include Content-Type and E2B-Traffic-Access-Token (plus existing X-Access-Token) for execute and all context endpoints; minor header construction cleanup.
• Tests & setup:
  • JS tests: Add secureSandboxTest (secure mode, network.allowPublicTraffic=false) and corresponding secure variants of basic/context tests; enhance tests/setup.ts with sandboxTestId metadata and configurable sandboxOpts.
  • Python tests: Add secure-traffic tests for async/sync basic and context flows using new factories; refactor conftest.py to provide sandbox_factory, async_sandbox_factory, persistent event loop, and per-test sandbox_test_id metadata.
• Changeset: Patch releases for @e2b/code-interpreter and @e2b/code-interpreter-python.

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[jakubno]

One small NIT otherwise lgtm