feat: add publish/sync/share commands and RegistryService for sharing and registry operations

[arnavk23]

Adds support for validating AsyncAPI documents with a custom Spectral ruleset and introduces basic registry operations (publish, sync, share) to allow sharing and syncing AsyncAPI files with remote endpoints/registries.

Fixes #1785

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Latest commit: 2918f98

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[sonarqubecloud]

Quality Gate passed

Issues
16 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud

[arnavk23]

• Custom Spectral ruleset loading via --ruleset (YAML/JSON).
• New RegistryService for basic publish/pull operations using auth from ~/.asyncapi/config.json.
• New CLI commands: publish, sync (push/pull), and share as a convenience wrapper around publish.
• Minimal auth integration using ConfigService.getAuthForUrl() so users can store tokens/headers in ~/.asyncapi/config.json.
• Simple, conservative HTTP-based interactions (POST for publish, GET for pull) so the feature is safe and easy to extend for specific registry protocols later.