MongoDB Log parser

[sydp]

Add a MongoDB Log File parser.

Example (src: https://www.mongodb.com/docs/manual/reference/log-messages/#log-messages):

{"t":{"$date":"2020-05-01T15:16:17.180+00:00"},"s":"I", "c":"NETWORK", "id":12345, "ctx":"listener", "msg":"Listening on","attr":{"address":"127.0.0.1"}}

Location setting: https://www.mongodb.com/docs/manual/reference/configuration-options/#mongodb-setting-systemLog.path