feat(logs): Add sentry.origin attribute for log handler

[AbhiPrasad]

resolves https://linear.app/getsentry/issue/LOGS-13

Docs: https://develop-docs-git-abhi-logs-sdk-developer-documentation.sentry.dev/sdk/telemetry/logs/#default-attributes

If a log is generated by an SDK integration, the SDK should also set the sentry.origin attribute, as per the Trace Origin documentation. It is assumed that logs without a sentry.origin attribute are manually created by the user.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.55%. Comparing base (adcfa0f) to head (6916b63).
Report is 4 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4250      +/-   ##
==========================================
+ Coverage   79.54%   79.55%   +0.01%     
==========================================
  Files         142      142              
  Lines       15898    15898              
  Branches     2721     2721              
==========================================
+ Hits        12646    12648       +2     
  Misses       2388     2388              
+ Partials      864      862       -2     

Files with missing lines	Coverage Δ
sentry_sdk/integrations/logging.py	82.89% <100.00%> (ø)

... and 5 files with indirect coverage changes