Add Dictionary Log Message Support

[TimPansino]

Overview

• To enable structured logging (JSON logging), accept dict values for message argument of record_log_event.
  • Unpack and add all message attributes to the event with the prefix message.
  • Retrieve any message field in the dictionary and treat as the log event's message for truncation purposes.
• Instrumentation changes for logging frameworks to follow in separate PRs.

[github-actions[bot]]

🦙 MegaLinter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
❌ PYTHON	bandit	5		1	5.9s
✅ PYTHON	black	6	0	0	1.72s
✅ PYTHON	flake8	6		0	1.15s
✅ PYTHON	isort	6	0	0	0.21s
✅ PYTHON	pylint	6		0	8.74s

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:exclamation: No coverage uploaded for pull request base (develop-logging-attributes@d98d5f2). Click here to learn what that means.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop-logging-attributes #1014 +/- ## ============================================================= Coverage ? 81.15% ============================================================= Files ? 190 Lines ? 19739 Branches ? 3457 ============================================================= Hits ? 16019 Misses ? 2725 Partials ? 995 ```

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