Fix StructLog Processors Assumptions

[TimPansino]

Overview

• Coerce structlog processors into a list at runtime to append out processor to.
  • Previously it was assumed that structlog would coerce processors into a list which our instrumentation could append to. This is not the case, and it can be any iterable.

Related Github Issue

Closes #1039

[github-actions[bot]]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	bandit	1		0	4.52s
✅ PYTHON	black	3	0	0	0.8s
✅ PYTHON	flake8	3		0	0.45s
✅ PYTHON	isort	3	0	0	0.18s
✅ PYTHON	pylint	3		0	3.28s

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[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (072eba8) 81.22% compared to head (5f80886) 81.20%.

Files	Patch %	Lines
newrelic/hooks/logger_structlog.py	40.00%	1 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1040 +/- ## ========================================== - Coverage 81.22% 81.20% -0.02% ========================================== Files 190 190 Lines 19727 19728 +1 Branches 3462 3462 ========================================== - Hits 16023 16020 -3 - Misses 2717 2719 +2 - Partials 987 989 +2 ```

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