fix(echo): support serializing nested messages

[richardapeters]

No description provided.

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

OpenSSF Scorecard

Package	Version	Score	Details

Scanned Manifest Files

[github-actions]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	12		0	0.05s
✅ CPP	clang-format	966	2	0	6.34s
✅ DOCKERFILE	hadolint	2		0	0.13s
✅ JSON	jsonlint	9		0	0.16s
✅ JSON	prettier	9	0	0	0.69s
⚠️ MARKDOWN	markdownlint	6	0	4	1.6s
⚠️ MARKDOWN	markdown-link-check	6		1	92.33s
✅ MARKDOWN	markdown-table-formatter	6	0	0	0.32s
✅ REPOSITORY	checkov	yes		no	22.27s
✅ REPOSITORY	git_diff	yes		no	0.06s
✅ REPOSITORY	grype	yes		no	17.01s
✅ REPOSITORY	ls-lint	yes		no	0.12s
✅ REPOSITORY	secretlint	yes		no	6.61s
✅ REPOSITORY	trivy	yes		no	12.4s
✅ REPOSITORY	trivy-sbom	yes		no	0.68s
✅ REPOSITORY	trufflehog	yes		no	3.27s
⚠️ SPELL	lychee	140		2	2.58s
⚠️ YAML	prettier	23	1	1	1.06s
✅ YAML	v8r	23		0	12.17s
✅ YAML	yamllint	23		0	0.42s

See detailed report in MegaLinter reports

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud