feat: validate nullable

[mathis-m]

respect nullable keyword

Description

If value === null and nullable then no validation error.

openapi: 3.0.1
info:
  title: v1
  version: v1
servers:
  - url: 'http://localhost:62242'
paths:
  /nullable:
    get:
      parameters:
        - name: "someNull"
          in: query
          required: false
          schema:
            type: number
            format: Int32
            nullable: true
          example: null
      responses:
        '200':
          description: Success
          content:
            text/json:
              schema:
                type: string
              example: "123"
            application/json:
              schema:
                type: string
              examples: 
                x:
                  value: "132"

Motivation and Context

Fixes #6927

How Has This Been Tested?

browser

Screenshots (if appropriate):

Checklist

My PR contains...

• No code changes (src/ is unmodified: changes to documentation, CI, metadata, etc.)
• Dependency changes (any modification to dependencies in package.json)
• Bug fixes (non-breaking change which fixes an issue)
• Improvements (misc. changes to existing features)
• Features (non-breaking change which adds functionality)

My changes...

• are breaking changes to a public API (config options, System API, major UI change, etc).
• are breaking changes to a private API (Redux, component props, utility functions, etc.).
• are breaking changes to a developer API (npm script behavior changes, new dev system dependencies, etc).
• are not breaking changes.

Documentation

• My changes do not require a change to the project documentation.
• My changes require a change to the project documentation.
• If yes to above: I have updated the documentation accordingly.

Automated tests

• My changes can not or do not need to be tested.
• My changes can and should be tested by unit and/or integration tests.
• If yes to above: I have added tests to cover my changes.
• If yes to above: I have taken care to cover edge cases in my tests.
• All new and existing tests passed.

[tim-lai]

@mathis-m PR merged! Thanks for the contribution!