fixed typing for Request constructor

[FlorianB-DE]

Summary

This fixes the typing issue with the Request constructor.
Typescript typing is used to prevent runtime errors with compile time checks.

In these lines

node-oauth2-server/lib/request.js

Lines 12 to 22 in cd81a3a

	if (!headers) {
	throw new InvalidArgumentError('Missing parameter: `headers`');
	}
	if (!method) {
	throw new InvalidArgumentError('Missing parameter: `method`');
	}
	if (!query) {
	throw new InvalidArgumentError('Missing parameter: `query`');
	}

, there are runtime errors thrown that are not reflected by the typescript typing and therefore not catchable by the Typescript compiler.

Linked issue(s)

#356 (comment)

Involved parts of the project

Typing declarations

Added tests?

No

[Copilot]

Copilot wasn't able to review any files in this pull request.

[shrihari-prakash]

Might as well be an enum, but I wouldn't insist it.