[heycam/webidl] Allow ES2020 BigInt values to be passed to operations taking integers. (#828)

**ES2020**&nbsp;adds the&nbsp;`BigInt`&nbsp;type, which&nbsp;allows for&nbsp;integers&nbsp;outside the&nbsp;<code>‑2<sup>53</sup>...2<sup>53</sup>&nbsp;‑&nbsp;1</code> to&nbsp;be&nbsp;represented in&nbsp;**JavaScript**&nbsp;code.

This&nbsp;makes it&nbsp;possible to&nbsp;handle the&nbsp;full&nbsp;range of&nbsp;`long` and&nbsp;`unsigned long` values&nbsp;in&nbsp;**JavaScript**.

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