refactor: update makeURLSearchParams to accept readonly non-Records

[kyranet]

Please describe the changes this PR makes and why it should be merged:

I didn't realize how painful it was to use the utility until I saw #8736 using them extensively. This patch ensures that:

1. We can pass non-Records:

     declare options: RESTGetAPIApplicationCommandsQuery;
   - makeURLSearchParams(options as Record<string, unknown>);
   + makeURLSearchParams(options);

2. We can cast types:

     // Expects `RESTGetAPIApplicationCommandsQuery`:
   - makeURLSearchParams({ withLocalizations: true }); // Should be `with_localizations``, doesn't raise type error.
   + makeURLSearchParams<RESTGetAPIApplicationCommandsQuery>({ withLocalizations: true }); // Raises type error due to mismatching types.

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating

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2 Ignored Deployments

Name	Status	Preview	Updated
discord-js	⬜️ Ignored (Inspect)		Nov 27, 2022 at 9:53AM (UTC)
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