feat(kb): Add Kibana API support with generated command definitions

[margaretjgu]

closes #72
autogenerated code from https://github.com/elastic/elastic-client-generator-js/pull/165

Summary

Adds the elastic kb command group for interacting with Kibana APIs. API definitions are auto-generated from the Kibana OpenAPI spec via the codegen in elastic-client-generator-js, following the same pattern as the existing ES and Cloud API commands.

• KibanaClient (src/lib/kibana-client.ts): fetch-based HTTP client with API key and basic auth support, automatic kbn-xsrf header for mutating requests
• Registration pipeline (src/kb/register.ts): dynamically builds Zod schemas and commander commands from declarative KbApiDefinition arrays (path/query/body params)
• Request builder (src/kb/request-builder.ts): path interpolation, querystring assembly, body collection with cliFlag awareness
• 48 generated API namespace files covering the full Kibana API surface (alerting, data views, fleet, security, spaces, SLO, etc.)
• 20 unit tests for the KibanaClient (auth, headers, URL construction, body serialization, error handling, factory)

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	4.39s
✅ REPOSITORY	gitleaks	yes		no	no	58.05s
✅ REPOSITORY	git_diff	yes		no	no	0.09s
✅ REPOSITORY	secretlint	yes		no	no	2.65s
✅ REPOSITORY	trivy	yes		no	no	18.41s
✅ TYPESCRIPT	eslint	57		0	0	4.98s

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