feat(aiohttp,sanic,tornado): Add user_agent.original attr for inbound filters

[sentrivana]

Bunched these three together since it's a very small change in each

Part 3 of https://linear.app/getsentry/issue/PY-2898/implement-user-agentoriginal

[github-actions]

Codecov Results 📊

✅ 131413 passed | ⏭️ 7189 skipped | Total: 138602 | Pass Rate: 94.81% | Execution Time: 451m 7s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +28
Passed Tests	📈 +24
Failed Tests	—
Skipped Tests	📈 +4

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2549 uncovered lines.
✅ Project coverage is 90.29%. Comparing base (294db4a) to head (393016a).

Files with missing lines (1)

File	Patch %	Lines
sentry_sdk/integrations/aiohttp.py	100.00%	⚠️ 1 partials

Coverage diff

@@            Coverage Diff             @@
##        master       #PR       +/-##
==========================================
+ Coverage    90.29%    90.29%        —%
==========================================
  Files          195       195         —
  Lines        26252     26261        +9
  Branches      9792      9798        +6
==========================================
+ Hits         23703     23712        +9
- Misses        2549      2549         —
- Partials      1486      1487        +1

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