Add "check-type-operator" option for whitespace rule

[adidahiya]

I'd like to lint for whitespace around type operators like | and &.

Test Cases

passing:

type StringOrNumber = string | number;

interface IFoo {
    someProp: string | number;
}

function foo(x: string | number) {
    //
}

failures:

type StringOrNumber = string|number;

interface IFoo {
    someProp: string|number;
}

function foo(x: string|number) {
    //
}

relevant: TS repo has a custom rule for this already; we can just copy the implementation: microsoft/TypeScript#5366

[ajafff]

Fixed by #3083