Please add documentation for, and add withDirConfig() to the QueryBuilder TS interface

[MatthewAry]

Is your feature request related to a problem? Please describe

See #2195

I was going crazy as to why I couldn't find a feature that should allow me to get properties from the _dir.yml file in same folder for the document I was querying, and then I found that it exists, but it was:

1. Not documented
2. Not included in queryBuilder interface

Basically it would be unreasonable to expect someone to find this functionality.

withDirConfig() is undocumented and untyped.

Describe the solution you'd like

Please add a type for withDirConfig() in

content/src/types/content.ts

Lines 436 to 499 in f65657f

	export interface QueryBuilder<T = ParsedContentMeta> {
	/**
	* Select a subset of fields
	*/
	only<const K extends keyof T>(keys: K): QueryBuilder<Pick<T, K>>
	only<const K extends (keyof T)[]>(keys: K): QueryBuilder<Pick<T, K[number]>>
	/**
	* Remove a subset of fields
	*/
	without<const K extends keyof T | string>(keys: K): QueryBuilder<Omit<T, K>>
	without<const K extends (keyof T | string)[]>(keys: K): QueryBuilder<Omit<T, K[number]>>
	/**
	* Sort results
	*/
	sort(options: SortOptions): QueryBuilder<T>
	/**
	* Filter results
	*/
	where(query: QueryBuilderWhere): QueryBuilder<T>
	/**
	* Limit number of results
	*/
	limit(count: number): QueryBuilder<T>
	/**
	* Skip number of results
	*/
	skip(count: number): QueryBuilder<T>
	/**
	* Fetch list of contents
	*/
	find(): Promise<Array<T>>
	/**
	* Fetch first matched content
	*/
	findOne(): Promise<T>
	/**
	* Fetch sorround contents
	*/
	findSurround(query: string | QueryBuilderWhere, options?: Partial<{ before: number; after: number }>): Promise<Array<T>>
	/**
	* Count matched contents
	*/
	count(): Promise<number>
	/**
	* Filter contents based on locale
	*/
	locale(locale: string): QueryBuilder<T>
	/**
	* Retrieve query builder params
	* @internal
	*/
	params: () => QueryBuilderParams
	}