Support for /messages

[Half-Shot]

Checklist

• Tests written for all new code
• Linter has been satisfied
• [N/A] Sign-off given on the changes (see CONTRIBUTING.md)

[tadzik]

Fixes turt2live#250?

[AndrewFerr]

To make merging easier, rebase this on upstream's main (bb93184), which had a release since this PR was filed.

[MTRNord]

The comment is apparently copied from elsewhere

Suggested change

	/**
	* Get relations for a given event.
	* @param {string} roomId The room ID to for the given event.
	* @param {string} eventId The event ID to list relations for.
	* @param {string?} relationType The type of relations (e.g. `m.room.member`) to filter for. Optional.
	* @param {string?} eventType The type of event to look for (e.g. `m.room.member`). Optional.
	* @returns {Promise<{chunk: any[]}>} Resolves to an object containing the chunk of relations
	*/
	/**
	* Get list of message and state events for a room using /messages.
	* @param {string} roomId The room ID to for the given event.
	* @param {string} dir Thedirection to paginate in.
	* @param {Partials<{filter: string, from: string, limit: number, to: string}>} opts Additional options to set for the request. Can be `filter`, `from`, `limit` and `to`.
	* @returns {Promise<{chunk: GetRoomMessagesResponse}>} Resolves to an object containing the chunk of messages
	*/