Can't validate ip address with JSON Schema format keyword.

[PMExtra]

• VS Code Version: 1.56.0
• OS Version: Windows_NT x64 10.0.19041

Steps to Reproduce:

1. Create a schema file:

{
  "properties": {
    "address": {
      "type": "string",
      "format": "ipv4"
    }
  }
}

2. Create a json file:

{
  "$schema": "path/to/the/above/schema",
  "address": "anything except a valid ipv4 address"
}

Expected result:

The address property should make a String is not a valid ipv4 address warning. Just like { "format": "email" } do.

Reference:
https://json-schema.org/understanding-json-schema/reference/string.html#ip-addresses

Does this issue occur when all extensions are disabled?: Yes

[PMExtra]

ipv6 does not work too.

[KapitanOczywisty]

We could probably use formats from ajv. FWIW, there is quite a few missing formats in vscode, which are present in JSON specification.

[aeschli]

Sounds good, PR is welcome that adds the missing regexes (please avoid new module dependencies)