Default validators do not check if OperationId is unique

[bara-pweber]

Describe the bug
If I validate a OpenApi document which uses a OperationId twice with hidi 2.0.0, I do not get a validation error.

OpenApi File To Reproduce

openapi: 3.0.0
info:
  title: Duplicate OperationId Example
  version: 1.0.0

paths:
  /users:
    get:
      summary: Get all users
      operationId: getUsers
      responses:
        '200':
          description: A list of users
  /admins:
    get:
      summary: Get all admins
      operationId: getUsers  # <-- Duplicate operationId
      responses:
        '200':
          description: A list of admins

Expected behavior
A validation error occurs and the duplicate OperationIds are pointed out.

[baywet]

Hi @bara-pweber
Thank you for using the SDK and for reaching out.
Is this something you would like to submit a pull request for?

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