js: DriverRemoteConnection: allow custom agent (#2240)

Allow users to provide their own http.Agent when initialising
DriverRemoteConnection.

This is extremely helpful connecting to databases within a corporate
network.

CHANGELOG.asciidoc

@@ -34,6 +34,7 @@ This release also includes changes from <<release-3-6-5, 3.6.6>> and <<release-3
 * Added new data type `DT` to represent periods of time.
 * Added Gherkin support for Date.
 * Added list filtering functions `all` and `any`.
+* Added `agent` parameter to `DriverRemoteConnection` options to allow a user-provided `http.Agent` implementation.
 
 [[release-3-7.0]]
 === TinkerPop 3.7.0 (Release Date: July 31, 2023)

gremlin-javascript/src/main/javascript/gremlin-javascript/lib/driver/client.js

@@ -46,6 +46,7 @@ class Client {
    * @param {Boolean} [options.pingEnabled] Setup ping interval. Defaults to: true.
    * @param {Number} [options.pingInterval] Ping request interval in ms if ping enabled. Defaults to: 60000.
    * @param {Number} [options.pongTimeout] Timeout of pong response in ms after sending a ping. Defaults to: 30000.
+   * @param {http.Agent} [options.agent] The http.Agent implementation to use.
    * @constructor
    */
   constructor(url, options = {}) {

gremlin-javascript/src/main/javascript/gremlin-javascript/lib/driver/connection.js

@@ -68,6 +68,7 @@ class Connection extends EventEmitter {
    * @param {Boolean} [options.pingEnabled] Setup ping interval. Defaults to: true.
    * @param {Number} [options.pingInterval] Ping request interval in ms if ping enabled. Defaults to: 60000.
    * @param {Number} [options.pongTimeout] Timeout of pong response in ms after sending a ping. Defaults to: 30000.
+   * @param {http.Agent} [options.agent] The http.Agent implementation to use.
    * @constructor
    */
   constructor(url, options) {
@@ -132,6 +133,7 @@ class Connection extends EventEmitter {
       cert: this.options.cert,
       pfx: this.options.pfx,
       rejectUnauthorized: this.options.rejectUnauthorized,
+      agent: this.options.agent,
     });
 
     this._ws.on('message', (data) => this._handleMessage(data));

gremlin-javascript/src/main/javascript/gremlin-javascript/lib/driver/driver-remote-connection.js

@@ -52,6 +52,7 @@ class DriverRemoteConnection extends RemoteConnection {
    * @param {Boolean} [options.pingEnabled] Setup ping interval. Defaults to: true.
    * @param {Number} [options.pingInterval] Ping request interval in ms if ping enabled. Defaults to: 60000.
    * @param {Number} [options.pongTimeout] Timeout of pong response in ms after sending a ping. Defaults to: 30000.
+   * @param {http.Agent} [options.agent] The http.Agent implementation to use.
    * @constructor
    */
   constructor(url, options = {}) {