Add support for ES2022 StaticBlock

[willdurand]

This is similar to eslint/eslint-visitor-keys#29.

[willdurand]

cc @michaelficarra, thanks

[connor4312]

Hit this today, would love to see this merged.

Example syntax:

class Foo {
  static {
    
  }
}

Associated estree:

{
  "type": "Program",
  "start": 0,
  "end": 33,
  "body": [
    {
      "type": "ClassDeclaration",
      "start": 0,
      "end": 33,
      "id": {
        "type": "Identifier",
        "start": 6,
        "end": 9,
        "name": "Foo"
      },
      "superClass": null,
      "body": {
        "type": "ClassBody",
        "start": 10,
        "end": 33,
        "body": [
          {
            "type": "StaticBlock",
            "start": 14,
            "end": 31,
            "body": []
          }
        ]
      }
    }
  ],
  "sourceType": "module"
}