Add maxLogFiles option (#6296)

https://community.parseplatform.org/t/server-log-retention/867/2

Maximum number of logs to keep. If not set, no logs will be removed. This can be a number of files or number of days. If using days, add 'd' as the suffix. (default: null).

I'll run this in production for a few days. I assume it works.

Useful for saving disk space.

Update winston-daily-rotate-file package to 4.4.0

src/Options/Definitions.js

@@ -19,7 +19,7 @@ module.exports.ParseServerOptions = {
   },
   allowCustomObjectId: {
     env: 'PARSE_SERVER_ALLOW_CUSTOM_OBJECT_ID',
-    help: 'Enable (or disable) custom objectId, defaults to false',
+    help: 'Enable (or disable) custom objectId',
     action: parsers.booleanParser,
     default: false,
   },
@@ -230,6 +230,12 @@ module.exports.ParseServerOptions = {
     help: 'Max value for limit option on queries, defaults to unlimited',
     action: parsers.numberParser('maxLimit'),
   },
+  maxLogFiles: {
+    env: 'PARSE_SERVER_MAX_LOG_FILES',
+    help:
+      "Maximum number of logs to keep. If not set, no logs will be removed. This can be a number of files or number of days. If using days, add 'd' as the suffix. (default: null)",
+    action: parsers.objectParser,
+  },
   maxUploadSize: {
     env: 'PARSE_SERVER_MAX_UPLOAD_SIZE',
     help: 'Max file size for uploads, defaults to 20mb',