MongoDB

.......... [ZBXNEXT-6891] added MongoDB implementation

* commit '64807b7ecdeceb8c8b27308917499f6a279d3c52': (21 commits)
  .......... [DEV-2185] updated *.Mongo.* to *.MongoDB.* in cconfig and readme
  .......... [DEV-2185] replaced Plugins.Mongo.System.Path with Plugins.MongoDB.System.Path in mongodb.conf and README.md
  .......... [DEV-2185] updated dependency
  .......... [DEV-2185] updated dependency
  .......... [DEV-2185] updated dependency
  .......... [DEV-2185] code clean up
  .......... [DEV-2185] moved plugin version variable to main.go
  .......... [DEV-2185] added flags and versioning support
  .......... [ZBXNEXT-6891] updated README.md to be more understandable
  .......... [ZBXNEXT-6891] code clean up
  .......... [ZBXNEXT-6891] updated README.md
  .......... [ZBXNEXT-6891] updated README.md
  .......... [ZBXNEXT-6891] fixed metrics not beeing assigned correctly
  .......... [ZBXNEXT-6891] code clean up
  .......... [ZBXNEXT-6891] cleaned up config file
  .......... [ZBXNEXT-6891] code clean up based on linter
  .......... [ZBXNEXT-6891] code clean up
  .......... [ZBXNEXT-6891] added license information
  .......... [ZBXNEXT-6891] added mongodb.sh.discovery metric
  .......... [ZBXNEXT-6891] added unit tests
  ...