chore: add load test to example-axum-otlp to monitor memory leak

[davidB]

try to reproduce a possible memory leak see #191

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ EDITORCONFIG	editorconfig-checker	6		0	0.02s
✅ JAVASCRIPT	standard	1	1	0	1.26s
✅ MARKDOWN	markdownlint	1	0	0	0.24s
✅ MARKDOWN	markdown-table-formatter	1	0	0	0.17s
✅ REPOSITORY	checkov	yes		no	10.15s
✅ REPOSITORY	dustilock	yes		no	0.0s
✅ REPOSITORY	gitleaks	yes		no	0.27s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	9.39s
✅ REPOSITORY	secretlint	yes		no	0.57s
✅ REPOSITORY	syft	yes		no	1.17s
✅ REPOSITORY	trivy-sbom	yes		no	0.07s
✅ REPOSITORY	trufflehog	yes		no	1.53s

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