Refactor part 2

[hmstepanek]

Overview

• Refactor openai chat completions to share common event creation logic.
• Refactor openai to utilize attributes getting dropped when they have a value of None.

[github-actions[bot]]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	bandit	1		0	5.43s
✅ PYTHON	black	10	0	0	1.65s
✅ PYTHON	flake8	10		0	0.73s
✅ PYTHON	isort	10	0	0	0.25s
✅ PYTHON	pylint	10		0	5.62s

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.98907% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 81.71%. Comparing base (b950070) to head (feff9b3). Report is 1 commits behind head on develop-ai-limited-preview-3.

Files	Patch %	Lines
newrelic/hooks/mlmodel_openai.py	93.98%	2 Missing and 9 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop-ai-limited-preview-3 #1093 +/- ## ================================================================ - Coverage 81.86% 81.71% -0.15% ================================================================ Files 192 192 Lines 21253 21172 -81 Branches 3711 3701 -10 ================================================================ - Hits 17398 17301 -97 - Misses 2783 2802 +19 + Partials 1072 1069 -3 ```

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