[whatwg/url] [ideas] Get value as number, date & boolean (Issue #702)

just considered that input has things like `input.valueAsNumber` and `input.valueAsDate`
and i thought to my self, hmm why don't `URLSearchParams` have something like that?

`URLSearchParams.prototype.get` only return strings.
what would you think if URLSearchParams was extended to support getAsNumber and more?

```js
new URLSearchParams('debug').getAsBoolean('debug') // true (just being absent means true)
new URLSearchParams('debug=1').getAsBoolean('debug') // true
new URLSearchParams('debug=true').getAsBoolean('debug') // true
new URLSearchParams('debug=somethingelse').getAsBoolean('debug') // ???
new URLSearchParams('debug=0').getAsBoolean('debug') // false
new URLSearchParams('debug=false').getAsBoolean('debug') // false
new URLSearchParams('').getAsBoolean('debug') // false
```
```js
new URLSearchParams('limit=10').getAsNumber('limit') // 10
new URLSearchParams('limit').getAsNumber('limit') // 0 or NaN
new URLSearchParams('limit=1e2').getAsNumber('limit') // 100
new URLSearchParams('').getAsNumber('limit') // 0 or NaN
new URLSearchParams('limit=0b11').getAsNumber('limit') // 3
new URLSearchParams('limit=abc').getAsNumber('limit') // NaN
// Maybe also want to get it as BigInt too?
// What about using parseInt and parseFloat?
```
```js
new URLSearchParams('created=2022-03-20').getAsDate('created') // new Date('2022-03-20')
// it would try first to get it as a number and if it's NaN then it use the value as a string to the constructor 
new URLSearchParams('created=0').getAsDate('created') // new Date(0) 
```


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