feat: add DPoP support for proof-of-possession mechanism in resourceServers

[kushalshit27]

🔧 Changes

• Introduce proof_of_possession validation in the resource servers schema and corresponding tests.

Examples Yaml format:

resourceServers:
  - name: "My API"
    identifier: "https://myapp.com/api/v1"
    scopes:
      - value: "update:account"
        description: "update account"
      - value: "read:account"
        description: "read account"
    .......................
    proof_of_possession:
      mechanism: "dpop"
      required: true

Examples JSON format:

{
  "name": "My API",
  "identifier": "https://myapp.com/api/v1",
  "scopes": [
    {
      "value": "write:messages",
      "description": "write messages"
    },
    {
      "value": "read:messages",
      "description": "read:messages"
    }
  ],
  .......................
  "proof_of_possession": {
    "mechanism": "dpop",
    "required": true
  }
}

• Update dependencies for eslint and undici to their latest versions, ensuring code quality and compatibility. Refactor promise syntax in tests for consistency.

📚 References

• https://auth0.com/docs/api/management/v2/resource-servers/post-resource-servers
• https://auth0.com/docs/api/management/v2/resource-servers/patch-resource-servers-by-id

🔬 Testing

• Unit test added
• E2E pass

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.30%. Comparing base (c4e4ccd) to head (f6ed79b).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1132   +/-   ##
=======================================
  Coverage   80.29%   80.30%           
=======================================
  Files         131      131           
  Lines        4964     4965    +1     
  Branches      978      978           
=======================================
+ Hits         3986     3987    +1     
  Misses        563      563           
  Partials      415      415           

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