feat: add --ruleset flag for custom Spectral rules

[Kartikayy007]

Description

• Adds a --ruleset flag to the validate command to support custom Spectral rulesets
• Supports JavaScript ruleset files (.js, .mjs, .cjs)
• Keeps the existing default AsyncAPI/Spectral validation behavior unchanged when --ruleset is not provided
• Allows teams to enforce organization-specific validation rules on AsyncAPI documents
• Clear error messages for unsupported file types and missing files

Related issue(s)

Resolves #1900
Part of #1785

Test plan

• Unit tests for custom ruleset validation (test/unit/services/validation.service.test.ts)
  • Custom JS ruleset loading and validation
  • Non-existent ruleset file error handling
• Manual testing with custom rulesets
• asyncapi validate --help shows the --ruleset flag

screenshot

[changeset-bot]

🦋 Changeset detected

Latest commit: 5b120e1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@asyncapi/cli	Minor

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Changeset has been generated for this PR as part of auto-changeset workflow.

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'@asyncapi/cli': minor
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feat: add --ruleset flag for custom Spectral rules

- 5872e92: feat: add --ruleset flag for custom Spectral rules
- 97ec751: fixed the sonar issue

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

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