fix: hide --input-file and --dry-run on no-input read-only commands

[margaretjgu]

Closes #378. defineCommand now takes a readOnly flag (set from the HTTP method in the es/kb/cloud registration layers) and hides --input-file and --dry-run when a command is read-only and its input schema has no fields, e.g. es info. Write commands with empty schemas and GET-with-body APIs like es search keep their flags; the docs/cli/schema.json diff is regeneration.

[github-actions]

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✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	0.97s
✅ REPOSITORY	gitleaks	yes		no	no	63.92s
✅ REPOSITORY	git_diff	yes		no	no	0.76s
✅ REPOSITORY	secretlint	yes		no	no	30.88s
✅ REPOSITORY	trivy	yes		no	no	17.32s
✅ TYPESCRIPT	eslint	6		0	0	5.59s

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