Allow .jsonc file imports

[hrumhurum]

Currently, Deno supports .json file imports:

import config from "./config.json" with { type: "json" };

Everything works well but sometimes imported .json files become pretty large and thus must have comments to ease the development.

An obvious solution for that would be:

import config from "./config.jsonc" with { type: "jsonc" };

But it does not work as of Deno 2.5.

[bartlomieju]

See #20374