feat(connection): bubble up monitorCommands events to Mongoose connection if monitorCommands option set

[vkarpov15]

Fix #14611

Summary

MongoDB driver introduced a handy set of commandStarted, commandFailed, commandSucceeded events that are great for monitoring performance. With this PR, we'll bubble those events up to the Mongoose connection if the monitorCommands option is set.

We shouldn't need to add monitorCommands to Mongoose's ConnectOptions because monitorCommands is already an option in MongoDB driver's connection options: https://github.com/mongodb/node-mongodb-native/blob/8fb43f86b22f98e488a3a98c0b562ca240ffdaa1/src/cmap/connection.ts#L118

Examples