Add PasswordPolicyControl

[its-sami]

I've done the steps outlined in ldapjs/node-ldapjs#946 (comment) but haven't linked to the issue as it's closed. Let me know if there's anything else I should do!

[jsumners]

Good work. Thank you for following the defined organization.

I have one question, do you think it would be appropriate to add a mechanism for error code lookup? We do it in:

controls/lib/controls/server-side-sorting-response-control.js

Lines 9 to 27 in 9718b85

	const validCodeNames = [
	'SUCCESS',
	'OPERATIONS_ERROR',
	'TIME_LIMIT_EXCEEDED',
	'STRONGER_AUTH_REQUIRED',
	'ADMIN_LIMIT_EXCEEDED',
	'NO_SUCH_ATTRIBUTE',
	'INAPPROPRIATE_MATCHING',
	'INSUFFICIENT_ACCESS_RIGHTS',
	'BUSY',
	'UNWILLING_TO_PERFORM',
	'OTHER'
	]
	const filteredCodes = Object.entries(RESULT_CODES).filter(([k, v]) => validCodeNames.includes(k))
	const VALID_CODES = new Map([
	...filteredCodes,
	...filteredCodes.map(([k, v]) => { return [v, k] })
	])

controls/lib/controls/server-side-sorting-response-control.js

Lines 44 to 49 in 9718b85

	/**
	* A map of possible response codes. Includes `CODE => VALUE` and
	* `VALUE => CODE`. For example, `RESPONSE_CODES.get(0)` returns
	* `LDAP_SUCCESS`, and `RESPONSE_CODES.get('LDAP_SUCCESS')` returns `0`.
	*/
	static RESPONSE_CODES = Object.freeze(VALID_CODES)

[its-sami]

Thanks, I had avoided a lookup like that as the error codes in the control don't match the result codes defined in the protocol. Also no mapping is defined in the similar case:

controls/lib/controls/entry-change-notification-control.js

Lines 8 to 14 in 9718b85

	/**
	* @typedef {object} EntryChangeNotificationControlValue
	* @property {number} changeType One of 1 (add), 2 (delete), 4 (modify),
	* or 8 (modifyDN).
	* @property {string} previousDN Only set when operation is a modifyDN op.
	* @property {number} changeNumber
	*/

I'd be happy to create some kind of mapping though.

[jsumners]

That's fair.

[jsumners]

Looks good to me.