[no-invalid-void-type] another use case for void type

[yangmingshan]

Repro

https://www.typescriptlang.org/play/index.html#code/PTAEBUAsEsGdQO7QDbNAYwIYFdYFNQ8AnIgeyICgAzbAO3QBdpTbQG9YGAKBmWALlB0AJnirRaeYQEpQAb1ABfChRCgAQtgZs+iFGgBGBcZNVga9JizYduvOIIBupaDPlKV7Tl2lA

{
  "rules": {
    "@typescript-eslint/no-invalid-void-type": "error"
  }
}

function test(this: void) { }
test()

Expected Result
No error.

Actual Result
Error: void is only valid as a return type or generic type variable

Additional Info
I think this is another valid use case that should be supported. Real life use case: vuejs/core#605

Versions

package	version
@typescript-eslint/eslint-plugin	3.1.0
@typescript-eslint/parser	3.1.0
TypeScript	3.9.3
ESLint	7.1.0
node	14.4.0
npm	6.14.5

[bradzacher]

See #2148
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