Add config options for json and urlencoded limits in express bodyParser

[reesesm2000]

Need to have the ability to configure the limits for the json and urlencoded in the Express bodyParser.

Changes needed in core.js as follows
Line 101 from
this._config = Object.assign({ webhook_uri: '/api/messages', dialogStateProperty: 'dialogState', disable_webserver: false }, config);
to
this._config = Object.assign({ webhook_uri: '/api/messages', dialogStateProperty: 'dialogState', disable_webserver: false, jsonLimit: '100kb', urlencodedLimit: '100kb' }, config);

Lines 138 and 139 from
this.webserver.use(bodyParser.json());
this.webserver.use(bodyParser.urlencoded({ extended: true }));
to
this.webserver.use(bodyParser.json({limit: this._config.jsonLimit, extended: true}));
this.webserver.use(bodyParser.urlencoded({limit: this._config.urlencodedLimit, extended: true }));

• Botkit version: 4.8.1
• Messaging Platform: Slack
• Node version: LTR
• Os: CentOS
• Any other relevant information:

[benbrown]

fixed in 4.9